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

test/units/cli/test_vault.py

@@ -41,9 +41,8 @@ class TestVaultCli(unittest.TestCase):
 
     def test_parse_empty(self):
         cli = VaultCLI([])
-        self.assertRaisesRegexp(errors.AnsibleOptionsError,
-                                '.*Missing required action.*',
-                                cli.parse)
+        self.assertRaises(SystemExit,
+                          cli.parse)
 
     # FIXME: something weird seems to be afoot when parsing actions
     # cli = VaultCLI(args=['view', '/dev/null/foo', 'mysecret3'])