[StarCluster] accessing 'default' group from a cluster

[Igor Tatarinov]

In our environment, we would really like to access our regular (NFS) /home
directory from an SGE cluster. We are also running NIS which we also need in
our clusters. I was hoping to implement necessary changes with a plugin but
that didn't work and I had to change a few lines of code.

In particular, adding access from the cluster to the default group cannot be
done in a plugin if any of the clustersetup.py code needs to mount an NFS
directory or access NIS. The plugins are executed after the default setup
which is too late in this case. I had to add the necessary permissions right
after the cluster group is created (and revoke those before the group is
deleted).

Hope this helps someone :)
igor
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