Deletes old trianing-labs folder
Deletes old trianing-labs folder

For some reason training-labs folder was still existing in the docs section.

Change-Id: I8817b41ed012fd590acb8944aaf69d062c899981
Implements: blueprint openstack-training-labs

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