Various additions to make sure timed out and failed hosts are taken out of the playbook even if failed

during setup, async tasks, or poll operations.  This introduced some redundancy so I've made some
notes in the code where things need to be refactored to remove them.

bin/ansible-playbook

@@ -60,6 +60,9 @@ class PlaybookCallbacks(object):
     def on_async_poll(self, jid, host, clock, host_result):
         print async_poll_status(jid, host, clock, host_result)
 
+    def on_dark_host(self, host, msg):
+        print "exception: [%s] => %s" % (host, msg)
+
 
 def main(args):
     ''' run ansible-playbook operations '''