fixes to config/setting retrieval

- better variable precedence management
- universal plugin option handling
- also updated comments for future directions
- leverage fragments for plugins
- removed fact namespacing
- added 'firendly name' field
- updated missing descriptions
- removed some unused yaml entries, updated others to reflect possible future
- documented more plugins
- allow reading docs using alias
- short licenses
- corrected args for 'all plugins'
- fixed -a option for ansible-doc
- updated vars plugins to allow docs
- fixed 'gathering'
- only set options IF connection
- added path list and renamed pathspec mostly the diff is , vs : as separator
- readded removed config entries that were deprecated but had no message ... and deprecated again
- now deprecated entries give warning when set

lib/ansible/plugins/action/__init__.py

@@ -392,7 +392,7 @@ class ActionBase(with_metaclass(ABCMeta, object)):
             # we have a need for it, at which point we'll have to do something different.
             return remote_paths
 
-        if self._play_context.become and self._play_context.become_user not in ('root', remote_user):
+        if self._play_context.become and self._play_context.become_user and self._play_context.become_user not in ('root', remote_user):
             # Unprivileged user that's different than the ssh user.  Let's get
             # to work!