XenAPI: Fix deprecated config options

I346ee0248c03e60716bd7dc4a5ee4493610867cb broke the XenServer CI as
devstack was still setting the deprecated config options.

Change-Id: Icd84212e97a9d5e007745be8096fa552bc23cb6f
Merge "XenAPI: Fix deprecated config options"
Merge branch 'master' of github.com:openstack-dev/devstack