Ansible Config part2 (#27448)

* Ansible Config part2

- made dump_me nicer, added note this is not prod
- moved internal key removal function to vars
- carry tracebacks in errors we can now show tracebacks for plugins on vvv
- show inventory plugin tracebacks on vvv
- minor fixes to cg groups plugin
- draft config from plugin docs
- made search path warning 'saner' (top level dirs only)
- correctly display config entries and others
- removed unneeded code
- commented out some conn plugin specific from base.yml
- also deprecated sudo/su
- updated ssh conn docs
- shared get option method for connection plugins
- note about needing eval for defaults
- tailored yaml ext
- updated strategy entry
- for connection pliugins, options load on plugin load
- allow for long types in definitions
- better display in ansible-doc
- cleaned up/updated source docs and base.yml
- added many descriptions
- deprecated include toggles as include is
- draft backwards compat get_config
- fixes to ansible-config, added --only-changed
- some code reoorg
- small license headers
- show default in doc type
- pushed module utils details to 5vs
- work w/o config file
- PEPE ATE!
- moved loader to it's own file
- fixed rhn_register test
- fixed boto requirement in make tests
- I ate Pepe
- fixed dynamic eval of defaults
- better doc code

skip ipaddr filter tests when missing netaddr
removed devnull string from config
better becoem resolution

* killed extra space with extreeme prejudice

cause its an affront against all that is holy that 2 spaces touch each other!

shippable timing out on some images, but merging as it passes most

lib/ansible/plugins/inventory/yaml.py

@@ -21,17 +21,19 @@ DOCUMENTATION:
     version_added: "2.4"
     short_description: Uses a specifically YAML file as inventory source.
     description:
-        - YAML based inventory, starts with the 'all' group and has hosts/vars/children entries.
+        - "YAML based inventory, starts with the 'all' group and has hosts/vars/children entries."
         - Host entries can have sub-entries defined, which will be treated as variables.
         - Vars entries are normal group vars.
-        - Children are 'child groups', which can also have their own vars/hosts/children and so on.
-        - File MUST have a valid extension: yaml, yml, json.
+        - "Children are 'child groups', which can also have their own vars/hosts/children and so on."
+        - File MUST have a valid extension, defined in configuration
     notes:
         - It takes the place of the previously hardcoded YAML inventory.
         - To function it requires being whitelisted in configuration.
     options:
-        _yaml_extensions:
+        yaml_extensions:
             description: list of 'valid' extensions for files containing YAML
+            type: list
+            default: ['.yaml', '.yml', '.json']
 EXAMPLES:
 all: # keys must be unique, i.e. only one 'hosts' per group
     hosts: