lookup_ldap: make Python 3.7 and Python 2.7 compatible.

[k0ste]

Actually rebased abandoned #21, but without builtins. Tested with Ansible 2.7.4 (I cut sensitive debug information).

Test data:

---
- name: jedi
  become: false
  gather_facts: fasle
  remote_user: k0ste
  no_log: false
  strategy: free
  hosts: 127.0.0.1
  tasks:
  - name: get_user_cisco
    debug:
      msg: "{{ item }}"
    with_ldap:
    - context: 'ldap_get_user'
    - value:
      - displayName
      - givenName
    - 'cisco'
  - name: get_user_bender_unicode
    debug:
      msg: "{{ item }}"
    with_ldap:
    - context: 'ldap_get_user'
    - value:
      - displayName: encoding=utf-8
      - givenName: encoding=utf-8
    - 'bender'
  - name: get_user_bender_cn_unicode
    debug:
      msg: "{{ item.cn }}"
    with_ldap:
    - context: 'ldap_get_user'
    - value:
      - cn: encoding=utf-8
      - displayName: encoding=utf-8
      - givenName: encoding=utf-8
    - 'bender'

Result, python 2.7.15:

ansible-playbook 2.7.4
  config file = /home/k0ste/ansible-fork/ansible.cfg
  configured module search path = [u'/home/k0ste/ansible/my_modules', u'/home/k0ste/ceph-ansible/library']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 2.7.15 (default, Jun 27 2018, 13:05:28) [GCC 8.1.1 20180531]
Using /home/k0ste/ansible-fork/ansible.cfg as config file
setting up inventory plugins
/home/k0ste/ansible-fork/inventory did not meet host_list requirements, check plugin documentation if this is unexpected
/home/k0ste/ansible-fork/inventory did not meet script requirements, check plugin documentation if this is unexpected
Parsed /home/k0ste/ansible-fork/inventory inventory source with ini plugin
Loading callback plugin default of type stdout, v2.0 from /usr/lib/python2.7/site-packages/ansible/plugins/callback/default.py
Loading callback plugin installer_checkpoint of type aggregate, v2.0 from /home/k0ste/ceph-ansible/plugins/callback/installer_checkpoint.pyc

PLAYBOOK: test.yml *************************************************************************************************************************************************************************************************
1 plays in test.yml

PLAY [jedi] ********************************************************************************************************************************************************************************************************

TASK [get_user_cisco] **********************************************************************************************************************************************************************************************
task path: /home/k0ste/ansible-fork/test.yml:10
ok: [127.0.0.1] => (item={'dn': u'cn=cisco,ou=people,dc=opentech,dc=local', 'term': u'cisco', 'givenName': u'Systems Inc', 'displayName': u'Cisco Systems Inc'}) => {
    "msg": {
        "displayName": "Cisco Systems Inc", 
        "dn": "cn=cisco,ou=people,dc=opentech,dc=local", 
        "givenName": "Systems Inc", 
        "term": "cisco"
    }
}

TASK [get_user_bender_unicode] *************************************************************************************************************************************************************************************
task path: /home/k0ste/ansible-fork/test.yml:19
ok: [127.0.0.1] => (item={'dn': u'cn=\u0420\u043e\u0434\u0440\u0438\u0433\u0435\u0441 \u0411\u0435\u043d\u0434\u0435\u0440 \u0421\u0433\u0438\u0431\u0430\u043b\u044c\u0449\u0438\u043a,ou=people,dc=opentech,dc=local', 'term': u'bender', 'givenName': u'\u0411\u0435\u043d\u0434\u0435\u0440 \u0421\u0433\u0438\u0431\u0430\u043b\u044c\u0449\u0438\u043a', 'displayName': u'\u0420\u043e\u0434\u0440\u0438\u0433\u0435\u0441 \u0411\u0435\u043d\u0434\u0435\u0440 \u0421\u0433\u0438\u0431\u0430\u043b\u044c\u0449\u0438\u043a'}) => {
    "msg": {
        "displayName": "Родригес Бендер Сгибальщик", 
        "dn": "cn=Родригес Бендер Сгибальщик,ou=people,dc=opentech,dc=local", 
        "givenName": "Бендер Сгибальщик", 
        "term": "bender"
    }
}

TASK [get_user_bender_cn_unicode] **********************************************************************************************************************************************************************************
task path: /home/k0ste/ansible-fork/test.yml:28
ok: [127.0.0.1] => (item={'dn': u'cn=\u0420\u043e\u0434\u0440\u0438\u0433\u0435\u0441 \u0411\u0435\u043d\u0434\u0435\u0440 \u0421\u0433\u0438\u0431\u0430\u043b\u044c\u0449\u0438\u043a,ou=people,dc=opentech,dc=local', 'term': u'bender', 'givenName': u'\u0411\u0435\u043d\u0434\u0435\u0440 \u0421\u0433\u0438\u0431\u0430\u043b\u044c\u0449\u0438\u043a', 'displayName': u'\u0420\u043e\u0434\u0440\u0438\u0433\u0435\u0441 \u0411\u0435\u043d\u0434\u0435\u0440 \u0421\u0433\u0438\u0431\u0430\u043b\u044c\u0449\u0438\u043a', 'cn': u'\u0420\u043e\u0434\u0440\u0438\u0433\u0435\u0441 \u0411\u0435\u043d\u0434\u0435\u0440 \u0421\u0433\u0438\u0431\u0430\u043b\u044c\u0449\u0438\u043a'}) => {
    "msg": "Родригес Бендер Сгибальщик"
}
META: ran handlers
META: ran handlers

PLAY RECAP *********************************************************************************************************************************************************************************************************
127.0.0.1                  : ok=3    changed=0    unreachable=0    failed=0   

Result, python 3.7.1:

ansible-playbook 2.7.4
  config file = /home/k0ste/ansible-fork/ansible.cfg
  configured module search path = ['/home/k0ste/ansible/my_modules', '/home/k0ste/ceph-ansible/library']
  ansible python module location = /usr/lib/python3.7/site-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 3.7.1 (default, Oct 22 2018, 10:41:28) [GCC 8.2.1 20180831]
Using /home/k0ste/ansible-fork/ansible.cfg as config file
setting up inventory plugins
/home/k0ste/ansible-fork/inventory did not meet host_list requirements, check plugin documentation if this is unexpected
/home/k0ste/ansible-fork/inventory did not meet script requirements, check plugin documentation if this is unexpected
Parsed /home/k0ste/ansible-fork/inventory inventory source with ini plugin
Loading callback plugin default of type stdout, v2.0 from /usr/lib/python3.7/site-packages/ansible/plugins/callback/default.py
Loading callback plugin installer_checkpoint of type aggregate, v2.0 from /home/k0ste/ceph-ansible/plugins/callback/installer_checkpoint.py

PLAYBOOK: test.yml ***********************************************************************************************************************************
1 plays in test.yml

PLAY [jedi] ******************************************************************************************************************************************

TASK [get_user_cisco] ********************************************************************************************************************************
task path: /home/k0ste/ansible-fork/test.yml:10
ok: [127.0.0.1] => (item={'term': 'cisco', 'dn': 'cn=cisco,ou=people,dc=opentech,dc=local', 'givenName': 'Systems Inc', 'displayName': 'Cisco Systems Inc'}) => {
    "msg": {
        "displayName": "Cisco Systems Inc",
        "dn": "cn=cisco,ou=people,dc=opentech,dc=local",
        "givenName": "Systems Inc",
        "term": "cisco"
    }
}

TASK [get_user_bender_unicode] ***********************************************************************************************************************
task path: /home/k0ste/ansible-fork/test.yml:19
ok: [127.0.0.1] => (item={'term': 'bender', 'dn': 'cn=Родригес Бендер Сгибальщик,ou=people,dc=opentech,dc=local', 'givenName': 'Бендер Сгибальщик', 'displayName': 'Родригес Бендер Сгибальщик'}) => {
    "msg": {
        "displayName": "Родригес Бендер Сгибальщик",
        "dn": "cn=Родригес Бендер Сгибальщик,ou=people,dc=opentech,dc=local",
        "givenName": "Бендер Сгибальщик",
        "term": "bender"
    }
}

TASK [get_user_bender_cn_unicode] ********************************************************************************************************************
task path: /home/k0ste/ansible-fork/test.yml:28
ok: [127.0.0.1] => (item={'term': 'bender', 'dn': 'cn=Родригес Бендер Сгибальщик,ou=people,dc=opentech,dc=local', 'givenName': 'Бендер Сгибальщик', 'cn': 'Родригес Бендер Сгибальщик', 'displayName': 'Родригес Бендер Сгибальщик'}) => {
    "msg": "Родригес Бендер Сгибальщик"
}
META: ran handlers
META: ran handlers

PLAY RECAP *******************************************************************************************************************************************
127.0.0.1                  : ok=3    changed=0    unreachable=0    failed=0   

[k0ste]

@quinot please take a look.