revision for this file was to add support for shared experiments by
joining with the exppid_access table to get the list of mounts (proj
and users) to export to the nodes in an experiment. Instead of just
the single proj and users in the proj, there are also all the proj
dirs and all the user dirs in all the projects that are in the share
list for the experiment. The real complicating factor is that the
exports file can list an IP only once per filesystem, so the simple
approach won't work, and the blindly stupid approach (one line per IP)
would cause the transient mount errors to get even worse. So, I had to
add some collescing code to try and solve both problems. Seems to
work.