Add EMC Volume Driver in Cinder

Add EMC Volume Driver in Cinder

Add support for EMC storage in the Cinder-Volume service.
This driver is based on the existing ISCSIDriver, with the ability to
create/delete and attach/detach volumes and create/delete snapshots, etc.
The Cinder Driver executes the volume operations by communicating with the
backend EMC storage. It uses a CIM client in python called PyWBEM to make
CIM operations over HTTP.
EMC CIM Object Manager (ECOM) is packaged with the SMI-S Provider. It is a
CIM server that allows CIM clients to make CIM operations over HTTP, using
SMI-S in the backend for EMC storage operations.
SMI-S Provider supports the SNIA Storage Management Initiative (SMI), an
ANSI standard for storage management. It supports VMAX/VMAXe and VNX
storage systems.

Implement bp: emc-volume-driver

Change-Id: Iafce98603d31d66a7297ef11c92d5e6ac6ba3737