This continues moving code only used by volume
drivers or the volume manager to volume_utils.
The result of this is that fewer drivers import
cinder.utils (and everything it imports), and less code
is loaded by non-volume cinder code (api service,
cinder-manage, etc.)
Closes-Bug: #1912278
Change-Id: I5aa82cf0de4c70f53ddc998bf25e64f4ad8f5774