Updated openstack/openstack
Project: openstack/nova  8404694daec4febffd1665ee5d3753177031f1d5
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Add XenAPI driver deprecation warning log message

The XenAPI driver does not have running CI and per the schedule,
is slated for deprecation in Icehouse-3. This adds the warning
message to the log to alert admins to this fact, in line with the
others we have been adding for drivers in similiar situations.

Change-Id: Iaff48aaca27d87c600291b8abcc23273a879366a