Don't use the send queue for stream initialization.

Use the parameter now=True to skip the queue when
sending Iq stanzas, or using xmpp.send().

sleekxmpp/test/sleektest.py

@@ -334,6 +334,8 @@ class SleekTest(unittest.TestCase):
         self.xmpp.process(threaded=True)
         if skip:
             if socket != 'live':
+                # Mark send queue as usable
+                self.xmpp.session_started_event.set()
                 # Clear startup stanzas
                 self.xmpp.socket.next_sent(timeout=1)
                 if mode == 'component':