Save object after updating for attachment_complete
Save object after updating for attachment_complete

Closes-Bug #1710295

Change-Id: Ibb4ac9f6eed448a6a13bd63312231910008c0737

openstack/cinder,phenoxim/cinder,eharney/cinder,mahak/cinder,phenoxim/cinder,Datera/cinder,eharney/cinder,openstack/cinder,j-griffith/cinder,j-griffith/cinder,Datera/cinder,mahak/cinder