"Allow node_exporter port in SELinux on RedHat OS family" fails on Debian9 with SELinux enabled

[sgargel]

What happened?

Seems this task is not working against a debian9 with SELinux enabled.

- name: Allow node_exporter port in SELinux on RedHat OS family
  seport:
    ports: "{{ node_exporter_web_listen_address.split(':')[-1] }}"
    proto: tcp
    setype: http_port_t
    state: present
  when:
    - ansible_version.full is version_compare('2.4', '>=')
    - ansible_selinux.status == "enabled"

TASK [cloudalchemy.node-exporter : Allow node_exporter port in SELinux on RedHat OS family] **************************************************************************************
Monday 28 December 2020  12:09:27 +0100 (0:00:01.755)       0:00:24.342 ******* 
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ImportError: No module named seobject
fatal: [debian8-server]: FAILED! => {"changed": false, "msg": "Failed to import the required Python library (policycoreutils-python) on debian8-server's Python /usr/bin/python. Please read module documentation and install in the appropriate location. If the required library is installed, but Ansible is using the wrong Python interpreter, please consult the documentation on ansible_python_interpreter"}

However the seport module is not tested against debian (https://docs.ansible.com/ansible/2.9/modules/seport_module.html#notes).

I'm not sure but probably the best idea is to disable the task by adding

- not ansible_distribution | lower == "debian"

If you agree I can do a PR.

Environment

• Role version:

  cloudalchemy.node-exporter (0.22.0)

• Ansible version information:

ansible 2.9.14
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/home/my/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/dist-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.18 (default, Aug  4 2020, 11:16:42) [GCC 9.3.0]

• Target packages:

# dpkg -l | grep -i selinux
ii  checkpolicy                    2.6-2                             amd64        SELinux policy compiler
ii  libselinux1:amd64              2.6-3+b3                          amd64        SELinux runtime shared libraries
ii  libsemanage-common             2.6-2                             all          Common files for SELinux policy management libraries
ii  libsemanage1:amd64             2.6-2                             amd64        SELinux policy management library
ii  libsepol1:amd64                2.6-2                             amd64        SELinux library for manipulating binary security policies
ii  policycoreutils                2.6-3                             amd64        SELinux core policy utilities
ii  policycoreutils-dev            2.6-3                             amd64        SELinux core policy utilities (development utilities)
ii  policycoreutils-python-utils   2.6-3                             amd64        SELinux core policy utilities (Python utilities)
ii  python-selinux                 2.6-3+b3                          amd64        Python bindings to SELinux shared libraries
ii  python3-selinux                2.6-3+b3                          amd64        Python3 bindings to SELinux shared libraries
ii  python3-semanage               2.6-2                             amd64        Python3 bindings for SELinux policy management
ii  python3-sepolgen               2.6-3                             all          Python3 module used in SELinux policy generation
ii  python3-sepolicy               2.6-3                             amd64        Python binding for SELinux Policy Analyses
ii  selinux-basics                 0.5.6                             all          SELinux basic support
ii  selinux-policy-default         2:2.20161023.1-9                  all          Strict and Targeted variants of the SELinux policy
ii  selinux-policy-dev             2:2.20161023.1-9                  all          Headers from the SELinux reference policy for building modules
ii  selinux-utils                  2.6-3+b3                          amd64        SELinux utility programs