Updated openstack/openstack
Project: openstack/oslo.db  65852717835be59c8bbc4ba3b0f2a8c707702726

Added check to see whether oslotest is installed

The projects that are using oslo.db in tests need to explicitly
include oslotest in their test-requirements.

Closes-bug: 1356425

Change-Id: I0ed01e141221d19af5593857c13a656f32d0f3cf