Updated openstack/openstack
Project: openstack-dev/devstack  320bf38e34ebbcac5757b229b6f5c86ac3b495dd
null
XenAPI:  Find location for XenAPI plugins

Plugins can be installed in different places in dom0; re-enable the
use of xapi_plugin_location

Change-Id: If94ec6b250ad5b4f7730cfbf443d937eb85feb5c