Fix bug 1332681

Fixes URL pointing towards old location of training manuals. Training manuals
has been migrated to new location github.com/openstack/training-guides. This
patch updates the URL to point towards the newer location of repository to
fetch the .zip file.

Closes-bug: #1332681
Implements blueprint openstack-training-guides

Change-Id: Ia196051311ed04c50d08769b1640981ae5a6d12c