Fixes Bug 1292800
Fixes Bug 1292800

Added basic guidelines to follow for best results with VitrualBox
for controller node.

blueprint training-manuals
Closes-Bug: #1292800

Change-Id: I77165ff0d6e8b15ec09c14cd85d239097da5e032

gongysh2004/openstack-manual,potsmaster/openstack-manuals,potsmaster/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,gongysh2004/openstack-manual,saeki-masaki/openstack-manuals,kairoaraujo/openstack-manuals,saeki-masaki/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,Akasurde/openstack-manuals,kairoaraujo/openstack-manuals,openstack/openstack-manuals,Akasurde/openstack-manuals,openstack/openstack-manuals