Print message when connection added to elimiate warning confusion

If the hostname is not changed, the warning message makes it look like
the network was not added when it in fact was. Adding a message saying
that the connection was added eliminates this confusion.

pifi/pifi.py

@@ -138,7 +138,7 @@ def add(ssid, password, var_io=var_io):
                 'ipv6': {'method': 'auto'}
         }
 
-
+    print("Added connection %s, will attempt to connect to it on future reboots" % ssid)
     pending.append(new_connection)
 
     try: