Volume discovery minimum 3.43 api version
Volume discovery minimum 3.43 api version

Set the volume api version to 3.43 to make
sure we get 3.41 change where it exposes
the user_id for snapshots.

This will fix the volume.snapshot.size metric
that is not working when trying to access the
user_id throws a AttributeError.

Change-Id: I2414717e7c9e64b0092fe93c97a062a48dbf09a8
Closes-Bug: 1794475

openstack/ceilometer,openstack/ceilometer