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 is exactly what is
currently done by OpenStack CI in project-config.
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: I141f3a470ccb299ab60f68ec9cef30069d4f2303
Change-Id: I93abcf684b5be97a733cba9c378af721f2c4f557
24f24f8745