At the moment, it is not possible for Ironic to clean up a
RAID array that is built from an entire device. This patch
allows it to do so by overriding the behaviour of attempting
to find the device name if the device names does not end with
a number and is a real block device.
Story: #2008663
Task: #41948
Change-Id: I66b0990acaec45b1635795563987b99f9fa04ac7