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

lib/ansible/plugins/callback/__init__.py

@@ -46,11 +46,6 @@ else:
 
 global_display = Display()
 
-try:
-    from __main__ import cli
-except ImportError:
-    # using API w/o cli
-    cli = False
 
 __all__ = ["CallbackBase"]
 
@@ -72,11 +67,6 @@ class CallbackBase(AnsiblePlugin):
         else:
             self._display = global_display
 
-        if cli:
-            self._options = cli.options
-        else:
-            self._options = None
-
         if self._display.verbosity >= 4:
             name = getattr(self, 'CALLBACK_NAME', 'unnamed')
             ctype = getattr(self, 'CALLBACK_TYPE', 'old')