Adds glance scripts for training labs

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

Change-Id: I63ffedf4f8be0efafc900e319b2a45fc2aa8562b
Co-Authored-By: Roger Luethi <rl@patchworkscience.org>
Partial-Bug: 1312764
Implements: blueprint openstack-training-labs
Merge "Adds glance scripts for training labs"