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.
Update README for this.
See also
http://lists.openstack.org/pipermail/openstack-dev/2016-November/107784.html
Needed-By: Ic42f8d5392ab1d9b52c6c84c92dee0092bd2779a
Change-Id: I253726467151622e8aa3ff40bacc0b3f9903b342