contint: disable tmpfs on labs slave

The tmpfs directory is used to speed up some tests hitting disk. On labs
we cant really create it because puppet does not know about the LDAP
provided user 'jenkins-deploy'.

Since there is no tmpfs there, just comment out the block to unbreak
puppet.  Will find out a proper solution later on.

Change-Id: Ice4ce41b70479fcd7d0efdec64d3987274ea0bc3