Adds keystone scripts for training labs

Adds keystone scripts for training labs which will install and configure
keystone and also populate the keystone database.

Co-Authored-By: Roger Luethi <rl@patchworkscience.org>
Change-Id: I21bafd5d43ce58ebc22029dc4897bb19104132a1
Partial-Bug: 1312764
Implements: blueprint openstack-training-labs