Updates generatelabs script
Updates generatelabs script

Removes unnecessary "bash -c" from the scripts as they are not
required and already being called from the tox.ini.

Change-Id: I533e32d37fd48c9f137ff528f85fb06437f322ce

Nabs007/training-guides,harrisonfeng/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,openstack/training-guides,openstack/training-guides,harrisonfeng/training-guides,Nabs007/training-guides