
Adding support for consistency groups in huawei driver. supports the following interfaces: 1.create_consistencygroup 2.delete_consistencygroup 3.update_consistencygroup 4.create_cgsnapshot 5.delete_cgsnapshot DocImpact Implements: blueprint support-huawei-consistency-group Change-Id: Ib35c382d1cc008f483a60da557781435dde098e1