Add a user to the Rocks cluster

As root:

1. For a normal user: useradd -g users jp
   1. For a super user: useradd -G users,wheel jp
2. Set the password with passwd jp
3. We now need to rocks sync users to sync the user with all of the cluster.
4. Logout with root and login with your new user. You should be able to login with no password on the compute nodes.