Add Oracle ZFSSA NFS Cinder Driver Support

This change will add a new Oracle ZFSSA NFS Driver to Cinder.
This driver supports all minimum features required by a driver for the kilo release.
This driver uses the base nfs driver methods for creating and deleting volumes.

Certification test results: https://bugs.launchpad.net/cinder/+bug/1400406

Change-Id: Id61fe3319172c8ff19ed421ead618e583a8d9263
Implements: blueprint oracle-zfssa-nfs-cinder-driver
Remove redundant args for clone_image method

The clone_image method takes both image_id and image_meta
as arguments.  No big deal, except the image id is included
in the image_meta; so there's really no reason to have both.

This patch removes the image_id argument and updates those
drivers that implement clone_image to extract the image ID
from the provided image_metadata.

Change-Id: Ibf3d3f7520f0e6d30081e98bdcbf1a07ebdb44ab
Merge "Add Oracle ZFSSA NFS Cinder Driver Support"
Merge "Remove redundant args for clone_image method"