Commit d05567cc3f added a temporary
translation shim so that the 'powervm' hypervisor type name in older
images used by the powervc driver in stackforge would not fail to
schedule due to an invalid (unregistered) hypervisor type.
The agreement from the powervc driver maintainers in stackforge was that
they'd put an image metadata translation shim in their driver so this
could be removed from nova in Liberty, which is now.
UpgradeImpact: Users of the nova-powervc driver from stackforge will
need to move to a version of that driver which
translates 'powervm' image metadata properly for
scheduling, or update the image metadata manually.
Change-Id: I31be654c817a00df2b4b51c184600c0c51c86443