Remove extras directory
Remove extras directory

In order to allow the easy addition of extra services to
config/scripts.*, the respective scripts need to exist in the scripts
directory. Therefore, the extras directory is not needed.

Change-Id: I2c0c3388b47188663c4e2cd02abdfff0cdf1fea4

openstack/training-labs,openstack/training-labs,openstack/training-labs