Add ceilometer volume and glance notifications ostf tests 

Added ceilometer volume measurements: volume, volume.size
Added ceilometer glance measurements: image, image.size, image.update,
image.upload, image.delete

Partially implements: blueprint ceilometer-ostf-notification-tests

Change-Id: Ie9f3a518bc5e24a4289220385a1e6e0ac0a41305