removed training-guide old directory
removed training-guide old directory

openstack-manuals/training-guide dir replaced by training-guides

Closes Bug: #1261281

Change-Id: Ia64b7180452a394239d6c1d04e0039599946dccc

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