Updated openstack/openstack
Project: openstack/oslo.db  26ba9dfadb364ce3e0492904db118a21eed3ecc6

Allow tox tests with complex OS_TEST_DBAPI_CONNECTION URLs

In particular, this allows OS_TEST_DBAPI_ADMIN_CONNECTION URLs with
alternate drivers like mysql+mysqlconnector://... to survive through
into OS_TEST_DBAPI_CONNECTION for the actual unittest.

Change-Id: I712d9366e616a551f4b2bd225de42469a35b363f