termination handling

- moved to base cli class to handle centrally and duplicate less code
- now avoids duplication and reiteration of signal handler by reassigning it
- left note on how to do non-graceful in case we add in future
  as I won't remember everything i did here and don't want to 'relearn' it.

lib/ansible/cli/adhoc.py

@@ -21,7 +21,6 @@ __metaclass__ = type
 ########################################################
 
 import os
-import signal
 
 from ansible import constants as C
 from ansible.cli import CLI
@@ -89,11 +88,6 @@ class AdHocCLI(CLI):
             tasks = [ dict(action=dict(module=self.options.module_name, args=parse_kv(self.options.module_args)), async=async, poll=poll) ]
         )
 
-    def _terminate(self, signum=None, framenum=None):
-        if signum is not None:
-            display.debug("Termination signal detected, shutting down gracefully")
-            raise SystemExit
-
     def run(self):
         ''' use Runner lib to do SSH things '''
 
@@ -176,9 +170,6 @@ class AdHocCLI(CLI):
         # now create a task queue manager to execute the play
         self._tqm = None
         try:
-            # Manage user interruptions
-            signal.signal(signal.SIGTERM, self._terminate)
-
             self._tqm = TaskQueueManager(
                     inventory=inventory,
                     variable_manager=variable_manager,