Updated openstack/openstack
Project: openstack/oslo.db  3fdafcd17f85e532342d5ddb45b972b5c462f843

Update help string to use database

Use "database" instead of "db" in help string as noticed during
review of https://review.openstack.org/#/c/120200/

Change-Id: I6e17c759ae101af23b7d57c13dfba26aa6feddb6