remove nfs mount locations, use default instead

Remove NFS mount point locations as they are not required.

There is a post from James Bayer on VCAP-DEV about this here:
https://groups.google.com/a/cloudfoundry.org/d/msg/vcap-dev/IqMCuSzEDFs/hYO11GPWMpYJ

Seems that having the mount points cause more problems than they resolve.