HDS Cinder Driver. Rev #1

blueprint hds-hus-iscsi-cinder-driver
This is the first rev of Hitachi Data Systems Cinder iSCSI driver.
This driver works with HUS (df850) array.
This driver contains all the base-line features specified for Havana release.
Amended into this submission are changes from code-reviews.

Docimpact: Bug #1180648

Change-Id: Ia27d076443b10da2c653456f9292dd192362b853
Merge "HDS Cinder Driver. Rev #1"