Add Oracle ZFS Storage Appliance ISCSI Driver

Add Oracle ZFS Storage Appliance ISCSI Driver

ZFSSA ISCSI Driver is designed for ZFS Storage Appliance product
line (ZS3-2, ZS3-4, ZS3-ES, 7420 and 7320).
It uses REST API to communicate out of band with the storage controller
to perform the following:
* Create/Delete Volume
* Extend Volume
* Create/Delete Snapshot
* Create Volume from Snapshot
* Delete Volume Snapshot
* Attach/Detach Volume
* Get Volume Stats
* Clone Volume

Update cinder.conf.sample to include ZFS Storage Appliance
properties.

Certification test results:
	https://bugs.launchpad.net/cinder/+bug/1356075

Change-Id: I2925c3e8cbe6f9d7a81ca70fcac7709714f07962
Implements: blueprint oracle-zfssa-cinder-driver