EMC VNX Direct Driver Update for Juno

EMC VNX Direct Driver Update for Juno

VNX Direct Driver has been contributed to Icehouse release.
This patch refactors driver and adds the following new features

* Array-based Backend Support
* FC Basic Support
* Target Port Selection for MPIO
* Initiator Auto Registration
* Storage Group Auto Deletion
* Multiple Authentication Type Support
* Storage-Assisted Volume Migration
* SP Toggle for HA
* Security File Support
* Advance LUN Features
    # Compression Support
    # Deduplication Support
    # FAST VP Support
    # FAST Cache Support
* Storage-assisted Retype
* External Volume Management
* Read-only Volume
* FC Auto Zoning

Certificate Test Results
    https://bugs.launchpad.net/cinder/+bug/1336640

CCLA SCHEDULE B SUBMISSION

Change-Id: Ib7edaefa5eceb8e8c01ec0ce0dcdada7eaa9dd08
Implements: blueprint emc-vnx-direct-driver-juno-update