Feature service groups

[msekania]

Additional plugin that manages service groups.

Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [X] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

What is the current behavior?

Issue Number: e.g. #1

What is the new behavior?

• manage service groups in Checkmk (create/modify/delete)
• bulk and single mode for contact group management

Other information

- name: "Create a single service group."
  tribe29.checkmk.service_group:
    server_url: "http://localhost/"
    site: "my_site"
    automation_user: "automation"
    automation_secret: "$SECRET"
    service_group_name: "my_service_group"
    title: "My Service Group"
    state: "present"
  delegate_to: localhost

- name: "Create service groups."
  tribe29.checkmk.service_group:
    server_url: "http://localhost/"
    site: "my_site"
    automation_user: "automation"
    automation_secret: "$SECRET"
    service_groups: "my_service_groups"
    title: "My Service Group"
    state: "present"
  vars:
    my_service_groups:
      - name: "service_one"
        title: "Service One"
      - name: "mail"
        title: "IMAP"
  delegate_to: localhost