VolumeSnapshot fails in europe-west12

I tried to create a volume snapshot in europe-west12 but got `Failed to create snapshot: failed to take snapshot of the volume projects/XXX/zones/europe-west12-a/disks/pvc-da12fb90-1832-4e6c-9187-24f4ab3f64d9: "rpc error: code = InvalidArgument desc = Invalid snapshot parameters: invalid location for snapshot: \"europe-west12\""`

I think the issue could be fixed in pr #2117 