Save the command line arguments into a global context

* Once cli args are parsed, they're constant.  So, save the parsed args
  into the global context for everyone else to use them from now on.
* Port cli scripts to use the CLIARGS in the context
* Refactor call to parse cli args into the run() method
* Fix unittests for changes to the internals of CLI arg parsing
* Port callback plugins to use context.CLIARGS
  * Got rid of the private self._options attribute
  * Use context.CLIARGS in the individual callback plugins instead.
  * Also output positional arguments in default and unixy plugins
  * Code has been simplified since we're now dealing with a dict rather
    than Optparse.Value

test/units/executor/test_task_queue_manager_callbacks.py

@@ -20,6 +20,9 @@ from __future__ import (absolute_import, division, print_function)
 
 from units.compat import unittest
 from units.compat.mock import MagicMock
+
+from ansible import arguments
+from ansible import context
 from ansible.executor.task_queue_manager import TaskQueueManager
 from ansible.playbook import Playbook
 from ansible.plugins.callback import CallbackBase
@@ -32,10 +35,11 @@ class TestTaskQueueManagerCallbacks(unittest.TestCase):
         inventory = MagicMock()
         variable_manager = MagicMock()
         loader = MagicMock()
-        options = MagicMock()
         passwords = []
 
-        self._tqm = TaskQueueManager(inventory, variable_manager, loader, options, passwords)
+        # Reset the stored command line args
+        arguments.GlobalCLIArgs._Singleton__instance = None
+        self._tqm = TaskQueueManager(inventory, variable_manager, loader, passwords)
         self._playbook = Playbook(loader)
 
         # we use a MagicMock to register the result of the call we
@@ -46,7 +50,8 @@ class TestTaskQueueManagerCallbacks(unittest.TestCase):
         self._register = MagicMock()
 
     def tearDown(self):
-        pass
+        # Reset the stored command line args
+        arguments.GlobalCLIArgs._Singleton__instance = None
 
     def test_task_queue_manager_callbacks_v2_playbook_on_start(self):
         """