Bump stable/havana next version to 2013.2.4

Change-Id: I011fb9e304a7c324279f0452c830891e9872e0ba
Skip xml test test_schedule_pool_with_down_agent

This patch causes the above test to be skipped as it has caused the havana
tests on the gate to be broken for a few weeks now. Since XML support doesn't
fully work in neutron and marked to be removed in juno skipping this xml test
should be okay.

Change-Id: I20fdf88ae129f77fa0a0ead9b552b4c4adfebbfc
Related-bug: 1311232
NSX: Fix 404 from raising on update_port if lswitch not in nsx

If one calls update_port and the lport is not stored in the nvp_lport_mapping
table in the database and the lswitch the lport resides on is not in nsx
we should catch NotFound and return the port in error state. This patch fixes
this for havana and also corrects the fake_api_client to raise NotFound in this
case. This problem does not exist in IceHouse though as we query NSX with *
which does not raise NotFound.

Change-Id: Ia01f900ade714b512b49fd3e803159a27599fee1
Closes-bug: #1311300
Related-bug: #1311291
Merge "NSX: Fix 404 from raising on update_port if lswitch not in nsx" into stable/havana
Merge "Skip xml test test_schedule_pool_with_down_agent" into stable/havana
Merge "Bump stable/havana next version to 2013.2.4" into stable/havana
Merge branch 'stable/havana' of https://github.com/openstack/quantum into havana/stable