Remove verbose option from glance_store tests
Remove verbose option from glance_store tests

'verbose' option has been deprecated in Mitaka in oslo.log.
See https://review.openstack.org/#/c/206437/ for more info
why it deprecated. Oslo folks are
going to delete it soon so we need to delete it also.

Change-Id: I60f2f2b553fefbcd1d7ea21da9ebf003133a320e

openstack/glance_store,openstack/glance_store