Add note about python-db jobs
Add note about python-db jobs

Add a note that python-db jobs are not really needed anymore and should
get replaced by using tools/test-setup.sh

See also:
http://lists.openstack.org/pipermail/openstack-dev/2016-November/107784.html

Change-Id: I0dc82dff02a606a43c07670def472b8cd3cdb09a

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