Keep v3 api-ref error response code 404 for reverting
Keep v3 api-ref error response code 404 for reverting

Client can still receive the 404/NotFound when attempting
the fetch of the volume.

Change-Id: Ieafaae5ccb5a23b4d3ad37b8e7eee40484346cfc
Signed-off-by: Xiaojun Liao <2e8c1e951f00b7420bde37b279619caed0f6747b@gmail.com>

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