better warning on non-local controller without ssh

also don't automatically try SSH.  The connector file could be being reused and on loopback on a laptop whose public IP changes depending on the network.

IPython/parallel/client/client.py

@@ -326,10 +326,10 class Client(HasTraits):
         if location is not None:
             proto,addr,port = util.split_url(url)
             if addr == '127.0.0.1' and location not in LOCAL_IPS and not sshserver:
-                sshserver = location
-                warnings.warn(
-                    "Controller appears to be listening on localhost, but is not local. "
-                    "IPython will try to use SSH tunnels to %s"%location,
+                warnings.warn("""
+            Controller appears to be listening on localhost, but not on this machine.
+            If this is true, you should specify Client(...,sshserver='you@%s')
+            or instruct your controller to listen on an external IP."""%location,
                     RuntimeWarning)
         
         self._config = cfg