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/cli/test_playbook.py

@@ -22,6 +22,7 @@ __metaclass__ = type
 from units.compat import unittest
 from units.mock.loader import DictDataLoader
 
+from ansible import context
 from ansible.inventory.manager import InventoryManager
 from ansible.vars.manager import VariableManager
 
@@ -32,7 +33,7 @@ class TestPlaybookCLI(unittest.TestCase):
     def test_flush_cache(self):
         cli = PlaybookCLI(args=["ansible-playbook", "--flush-cache", "foobar.yml"])
         cli.parse()
-        self.assertTrue(cli.options.flush_cache)
+        self.assertTrue(context.CLIARGS['flush_cache'])
 
         variable_manager = VariableManager()
         fake_loader = DictDataLoader({'foobar.yml': ""})