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

test/sanity/code-smell/boilerplate.sh

@@ -5,6 +5,7 @@ future1=$(find ./bin -type f -exec grep -HL 'from __future__ import (absolute_im
 
 metaclass2=$(find ./lib/ansible -path ./lib/ansible/modules -prune \
         -o -path ./lib/ansible/modules/__init__.py \
+        -o -path ./lib/ansible/config/__init__.py \
         -o -path ./lib/ansible/module_utils -prune \
         -o -path ./lib/ansible/module_utils/six/_six.py -prune \
         -o -path ./lib/ansible/compat/selectors/_selectors2.py -prune \
@@ -15,6 +16,7 @@ metaclass2=$(find ./lib/ansible -path ./lib/ansible/modules -prune \
 
 future2=$(find ./lib/ansible -path ./lib/ansible/modules -prune \
         -o -path ./lib/ansible/modules/__init__.py \
+        -o -path ./lib/ansible/config/__init__.py \
         -o -path ./lib/ansible/module_utils -prune \
         -o -path ./lib/ansible/module_utils/six/_six.py -prune \
         -o -path ./lib/ansible/compat/selectors/_selectors2.py -prune \