Revert "centralized TERM signal handling"

This reverts commit 5a88478ccc.
is WIP, not ready for use yet

lib/ansible/executor/playbook_executor.py

@@ -22,6 +22,7 @@ __metaclass__ = type
 import getpass
 import locale
 import os
+import signal
 import sys
 
 from ansible.compat.six import string_types
@@ -68,6 +69,8 @@ class PlaybookExecutor:
         may limit the runs to serialized groups, etc.
         '''
 
+        signal.signal(signal.SIGTERM, self._terminate)
+
         result = 0
         entrylist = []
         entry = {}
@@ -204,6 +207,10 @@ class PlaybookExecutor:
 
         return result
 
+    def _terminate(self, signum=None, framenum=None):
+        display.debug("Termination signal detected, shutting down gracefully")
+        raise SystemExit
+
     def _get_serialized_batches(self, play):
         '''
         Returns a list of hosts, subdivided into batches based on