Migrate command line parsing to argparse (#50610)

* Start of migration to argparse

* various fixes and improvements

* Linting fixes

* Test fixes

* Fix vault_password_files

* Add PrependAction for argparse

* A bunch of additional tweak/fixes

* Fix ansible-config tests

* Fix man page generation

* linting fix

* More adhoc pattern fixes

* Add changelog fragment

* Add support for argcomplete

* Enable argcomplete global completion

* Rename PrependAction to PrependListAction to better describe what it does

* Add documentation for installing and configuring argcomplete

* Address rebase issues

* Fix display encoding for vault

* Fix line length

* Address rebase issues

* Handle rebase issues

* Use mutually exclusive group instead of handling manually

* Fix rebase issues

* Address rebase issue

* Update version added for argcomplete support

* -e must be given a value

* ci_complete

bin/ansible

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-
+# -*- coding: utf-8 -*-
 # (c) 2012, Michael DeHaan <michael.dehaan@gmail.com>
 #
 # This file is part of Ansible
@@ -17,7 +17,8 @@
 # You should have received a copy of the GNU General Public License
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
-########################################################
+# PYTHON_ARGCOMPLETE_OK
+
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type