1st part of ansible config, adds ansible-config to view/manage configs (#12797)

* Start of ansible config project

moved configuration definitions to external yaml file vs hardcoded
 * updated constants to be a data strcutures that are looped over and also return origin of setting
changed to manager/data scheme for base classes
new cli ansible-config to view/manage ansible configuration settings
 * prints green for default/unchanged and yellow for those that have been overriden
 * added list action to show all configurable settings and their associated ini and env var names
 * allows specifying config file to see what result would look like
 * TBD update, edit and view options

removed test for functions that have been removed

env_Vars are now list of dicts
allows for version_added and deprecation in future
added a couple of descriptions for future doc autogeneration
ensure test does not fail if delete_me exists
normalized 'path expansion'
added yaml config to setup packaging
removed unused imports
better encoding handling

updated as per feedback

* pep8

lib/ansible/plugins/shell/__init__.py

@@ -34,11 +34,12 @@ class ShellBase(object):
     def __init__(self):
         self.env = dict()
         if C.DEFAULT_MODULE_SET_LOCALE:
+            module_locale = C.DEFAULT_MODULE_LANG or os.getenv('LANG', 'en_US.UTF-8')
             self.env.update(
                 dict(
-                    LANG=C.DEFAULT_MODULE_LANG,
-                    LC_ALL=C.DEFAULT_MODULE_LANG,
-                    LC_MESSAGES=C.DEFAULT_MODULE_LANG,
+                    LANG=module_locale,
+                    LC_ALL=module_locale,
+                    LC_MESSAGES=module_locale,
                 )
             )