Labs: make autofs forcibly use nfs4 for labsnfs

Ubundu Lucid (of which there remains some instances) doesn't
automatically select nfs4 rather than nfs3 according to mount
options; this makes the version explicit for /home and
/data/project when using labsnfs.

Change-Id: Idf8aed52f6ef2d975fd98e7b623521f970ac05cc
Merge "Labs: make autofs forcibly use nfs4 for labsnfs" into production