Update manifest and spec to use new NetApp unified driver config
options.

Change-Id: Ie89aa511d676a5cbd737ee790a6fbbad93e2abf1
Closes-Bug: 1261865
Add support for VMDK driver

The patch adds support for VMware vmdk cinder driver. It also
supports configuring the driver for multi-backend scenarios.

implements blueprint support-vmdk-driver

Change-Id: I3f50f9974100ceab2a991f692022dd918f2e4445
Merge "Update manifest and spec to use new NetApp unified driver config options."