refactoring async

- centralized skipping
- also fixed module name broken by previous refactor
- let action modules handle async processing
- moved async into base action class's module exec
- action plugins can now run final action as async
- actually skip copy if base skips
- fixed normal for new paths
- ensure internal stat is never async
- default poll to 10 as per docs
- added hint for callback fix on poll
- restructured late tmp, now a pipeline query
- moving action handler to connection as networking does
- fixed network assumption invocation is always passed
- centralized key cleanup, normalized internal var
- _supress_tmpdir_delete now in _ansible_xxx and gets removed from results
- delay internal key removal till after we use em
- nicer tmp removing, using existing methods
- moved cleanup tmp flag to mking tmp func

lib/ansible/plugins/action/add_host.py

@@ -41,14 +41,12 @@ class ActionModule(ActionBase):
     TRANSFERS_FILES = False
 
     def run(self, tmp=None, task_vars=None):
-        if task_vars is None:
-            task_vars = dict()
+
+        self._supports_check_mode = False
 
         result = super(ActionModule, self).run(tmp, task_vars)
 
-        if self._play_context.check_mode:
-            result['skipped'] = True
-            result['msg'] = 'check mode not supported for this module'
+        if result.get('skipped', False):
             return result
 
         # Parse out any hostname:port patterns