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 and tox-db
jobs to python-jobs and tox since these will call this script initially.
See also
http://lists.openstack.org/pipermail/openstack-dev/2016-November/107784.html
Needed-By: I88ab65c582d42fc815440af4345c6d97d4c70a29
Change-Id: I06a89e31d97a4253580ede1b09dd4504ca38f226
cfbb844c5e