There are some platform specific changes needed to allow os-brick to
support FCP on System z: the System z specific format of the device
file paths, adding and removing devices explicitly, and ignoring vHBAs
which are offline.
Based on Cinder: https://review.openstack.org/#/c/149256/
Partial-Implements blueprint linux-systemz
Change-Id: Ie75454da974939e03dfc77e760ba5215324b7fdc