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/strategy/__init__.py

@@ -32,6 +32,7 @@ from multiprocessing import Lock
 from jinja2.exceptions import UndefinedError
 
 from ansible import constants as C
+from ansible import context
 from ansible.errors import AnsibleError, AnsibleFileNotFound, AnsibleParserError, AnsibleUndefinedVariable
 from ansible.executor import action_write_locks
 from ansible.executor.process.worker import WorkerProcess
@@ -170,9 +171,9 @@ class StrategyBase:
         self._variable_manager = tqm.get_variable_manager()
         self._loader = tqm.get_loader()
         self._final_q = tqm._final_q
-        self._step = getattr(tqm._options, 'step', False)
-        self._diff = getattr(tqm._options, 'diff', False)
-        self.flush_cache = getattr(tqm._options, 'flush_cache', False)
+        self._step = context.CLIARGS.get('step', False)
+        self._diff = context.CLIARGS.get('diff', False)
+        self.flush_cache = context.CLIARGS.get('flush_cache', False)
 
         # the task cache is a dictionary of tuples of (host.name, task._uuid)
         # used to find the original task object of in-flight tasks and to store