Add a state parameter to the wait_for module.

This takes started, stopped and restarted.

Started returns when connecting is possible.
Stopped when connecting is not possible.
Restarted first waits for connecting to be impossible and returns when it is
possible again.

library/wait_for

@@ -30,6 +30,7 @@ def main():
             name=dict(required=True),
             timeout=dict(default=300),
             port=dict(default=22),
+            state=dict(default='started', choices=['started', 'stopped', 'restarted']),
         ),
     )
 
@@ -38,7 +39,26 @@ def main():
     host = params['name']
     timeout = int(params['timeout'])
     port = int(params['port'])
+    state = params['state']
 
+    if state in [ 'stopped', 'restarted']:
+        ### first wait for the host to go down
+        end = datetime.datetime.now() + datetime.timedelta(seconds=timeout)
+
+        while datetime.datetime.now() < end:
+            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            s.settimeout(5)
+            try:
+                s.connect( (host, port) )
+                s.close()
+                time.sleep(1)
+            except:
+                break
+        else:
+            module.fail_json(msg="Timeout when waiting for %s to stop."%(host))
+
+    if state in [ 'started', 'restarted' ]:
+        ### wait for the host to come up
         end = datetime.datetime.now() + datetime.timedelta(seconds=timeout)
 
         while datetime.datetime.now() < end:
@@ -52,7 +72,7 @@ def main():
         else:
             module.fail_json(msg="Timeout when waiting for %s"%(host))
 
-    module.exit_json(msg="%s responds on %s"%(host, port))
+    module.exit_json(msg="State of %s on %s is %s."%(host, port, state))
 
 # this is magic, see lib/ansible/module_common.py
 #<<INCLUDE_ANSIBLE_MODULE_COMMON>>