Handle search_ext() returning ldap.SUCCESS

In ipa-replica-prepare a call to search_ext() was returning ldap.SUCCESS.
The search actually was fine and returned data but an exception was returned
and handled (though we didn't know what to do with it). This patch
lets it continue along.

ticket 285

ipaserver/plugins/ldap2.py

@@ -99,6 +99,8 @@ def _handle_errors(e, **kw):
         raise errors.LimitsExceeded()
     except _ldap.TIMELIMIT_EXCEEDED, e:
         raise errors.LimitsExceeded()
+    except _ldap.SUCCESS:
+        pass
     except _ldap.LDAPError, e:
         raise errors.DatabaseError(desc=desc, info=info)