Merge "Dell SC: Fix Consistency Group issues"

diff --cc cinder/tests/unit/test_dellsc.py
Simple merge

diff --cc cinder/tests/unit/test_dellscapi.py
Simple merge

diff --cc cinder/volume/drivers/dell/dell_storagecenter_api.py
Simple merge

diff --cc cinder/volume/drivers/dell/dell_storagecenter_common.py
Simple merge