Had to move the cfg directory to the metadata volume and link it under the instance
directory to provide the proper separation in a shared volume environment. The
instance specific vars cannot be in a shared directory since they need to be different
on each node using the shared volume.
Since the files moved back to the instance directory, I changed the names back to:
instance_vars
p4review.cfg
to keep things simple.
Also moved p4_vars.template to SDP/Server/Unix/p4/common/cfg so that it doesn't get
copied to the /p4/common/bin folder. Plus, it makes more sense for it to be in that
directory in the SDP structure.