Move the arguments module into cli/ and context_objects into utils

* Note: Python2 is not as intelligent at detecting false import loops as
  Python3.  context_objects.py cannot be added to cli/arguments because it
  would set up an import loop between cli/__init__.py,
  cli/arguments/context_objects.py, and context.py on Python2.

ci_complete

test/units/arguments/test_optparse_helpers.py

@@ -1,19 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright: (c) 2018, Ansible Project
-# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
-
-# Make coding more python3-ish
-from __future__ import (absolute_import, division)
-__metaclass__ = type
-
-import pytest
-
-from ansible.arguments import optparse_helpers as opt_help
-
-
-class TestOptparseHelpersVersion:
-
-    def test_version(self):
-        ver = opt_help.version('ansible-cli-test')
-        assert 'ansible-cli-test' in ver
-        assert 'python version' in ver