Updated openstack/openstack
Project: openstack/nova  8bbad1c1de79ad97adef138552456c4bc32090d5
null
Refactor pool.py to remove calls to call_xenapi

In addition adding the Pool XenAPI object that is needed by pool.py

Change-Id: I1b417c469bbb2542a3fde40064142bde2b4dd400