Fix issues of disco info leaking between entities with the same bare JIDs.

To ensure that disco info, or any settings which depend on the bound
JID, are correct, only set such information on or after the
session_bound event has fired.

sleekxmpp/api.py

@@ -99,7 +99,7 @@ class APIRegistry(object):
         """
         self._setup(ctype, op)
 
-        if jid in (None, ''):
+        if not jid:
             jid = self.xmpp.boundjid
         if jid and not isinstance(jid, JID):
             jid = JID(jid)
@@ -113,7 +113,7 @@ class APIRegistry(object):
             else:
                 jid = jid.full
         else:
-            if self.settings[ctype].get('client_bare', True):
+            if self.settings[ctype].get('client_bare', False):
                 jid = jid.bare
             else:
                 jid = jid.full