Update unit tests with new /dev/mapper devnode
Update unit tests with new /dev/mapper devnode

Signed-off-by: Luis Pabón <e0c09d35b5ba288a4d2f5dad87cf314a1461423f@redhat.com>

humblec/heketi,humblec/heketi,humblec/heketi,humblec/heketi