Dont use Resolver when using a proxy

This leaks the DNS request

gajim/common/connection.py

@@ -1083,7 +1083,8 @@ class Connection(CommonConnection, ConnectionHandlers):
         self._hosts = [ {'host': h, 'port': p, 'ssl_port': ssl_p, 'prio': 10,
                 'weight': 10} ]
         self._hostname = hostname
-        if use_srv:
+
+        if use_srv and self._proxy is None:
             # add request for srv query to the resolve, on result '_on_resolve'
             # will be called
             app.resolver.resolve('_xmpp-client._tcp.' + helpers.idn_to_ascii(
@@ -1823,6 +1824,7 @@ class Connection(CommonConnection, ConnectionHandlers):
 
         self.sm.resuming = False # back to previous state
         # Discover Stun server(s)
+        if self._proxy is None:
             hostname = app.config.get_per('accounts', self.name, 'hostname')
             app.resolver.resolve('_stun._udp.' + helpers.idn_to_ascii(hostname),
                     self._on_stun_resolved)