Does required changes for Icehouse release

Training guides is following in the footsteps of openstack-manuals
program and following the given document for releasing Icehouse
release for training guides.

Change-Id: I4ced02f81c9bbd2d213746b6e05da236e9009168
Link: https://wiki.openstack.org/wiki/Documentation/Release
Merge "Does required changes for Icehouse release"