Fix plugins (names, constants, FQCNs in examples) (#722)

* cobbler inventory: fix NAME

* oc transport: fix transport name

* Inventory plugins: fix plugin identifications

* Use FQCN in lookup plugin examples.

* Use FQCN in callback plugins.

* Add changelog fragment.

* Adjust documentation.

* Fix lookup plugin linting errors.

* Fix quotes.

(cherry picked from commit ea21341686)

plugins/inventory/gitlab_runners.py

@@ -28,6 +28,7 @@ DOCUMENTATION = '''
             required: true
             choices:
               - gitlab_runners
+              - community.general.gitlab_runners
         server_url:
             description: The URL of the GitLab server, with protocol (i.e. http or https).
             env:
@@ -60,11 +61,11 @@ DOCUMENTATION = '''
 
 EXAMPLES = '''
 # gitlab_runners.yml
-plugin: gitlab_runners
+plugin: community.general.gitlab_runners
 host: https://gitlab.com
 
 # Example using constructed features to create groups and set ansible_host
-plugin: gitlab_runners
+plugin: community.general.gitlab_runners
 host: https://gitlab.com
 strict: False
 keyed_groups: