Add simple script to setup mysql and postgresql databases, this script
can be run by users during testing and will be run by CI systems for
specific setup before running unit tests.
This allows to change in project-config the python-db jobs to
python-jobs since python-jobs will call this script initially.
See also
http://lists.openstack.org/pipermail/openstack-dev/2016-November/107784.html
Needed-By: I46d883ce1b25338d01a2b0e2b071b15adab00520
Change-Id: I8c5015616a5a12501edd16932d4148930c01a06b
