add an id to jingle ICE UDP transports

src/common/gajim.py

@@ -222,6 +222,12 @@ caps_hash = {}
 import caps_cache
 caps_cache.initialize(logger)
 
+global_id = 0
+def get_an_id():
+    global global_id
+    global_id += 1
+    return global_id
+
 def get_nick_from_jid(jid):
     pos = jid.find('@')
     return jid[:pos]

src/common/jingle_transport.py

@@ -351,6 +351,7 @@ class JingleTransportICEUDP(JingleTransport):
                 'network': '0',
                 'port': candidate.port,
                 'priority': int(candidate.priority), # hack
+                'id': gajim.get_an_id()
         }
         if candidate.type in types:
             attrs['type'] = types[candidate.type]