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/parsing/dataloader.py

@@ -80,6 +80,17 @@ class DataLoader:
         a JSON or YAML string.
         '''
         new_data = None
+
+        # YAML parser will take JSON as it is a subset.
+        if isinstance(data, AnsibleUnicode):
+            # The PyYAML's libyaml bindings use PyUnicode_CheckExact so
+            # they are unable to cope with our subclass.
+            # Unwrap and re-wrap the unicode so we can keep track of line
+            # numbers
+            in_data = text_type(data)
+        else:
+            in_data = data
+
         try:
             # we first try to load this data as JSON
             new_data = json.loads(data)