Driver for IBM Storwize and SVC storage.
Driver for IBM Storwize and SVC storage.

Volume driver for IBM Storwize and SVC storage systems, along with unit
tests and updated sample config file. The unit tests include a
Storwize/SVC management simulator to allow for testing without
controller hardware. Also added a new exception for volume drivers.

Co-authored-by: Ronen Kat <ronenkat@il.ibm.com>

Change-Id: I3fe9cfcca8d4bddb71c763b526105e34f2652557

citrix-openstack-build/oslo.versionedobjects,openstack/oslo.versionedobjects