oslo.db: don't run tests with SQLAlchemy 0.9.x
oslo.db: don't run tests with SQLAlchemy 0.9.x

We've been running tests with different SQLAlchemy release series
supported, but since Ic7ab3b9e6dc8354861be1af46210269f74c04333
oslo.db actually requires SQLAlchemy >= 1.0.10, so testing of 0.9.x
versions is not needed anymore.

Keep the job for stable/kilo and stable/liberty.

Change-Id: I591ec39572a725455aef52b3bc60d7a419daeb16

openstack-infra/project-config,Tesora/tesora-project-config,dongwenjuan/project-config,dongwenjuan/project-config,Tesora/tesora-project-config,openstack-infra/project-config