Split out the various common configurations into simple config files.

Split out the various common configurations into simple config files.
These will be used by various scripts for configuration, and can be
copied, combined, edited for each user as desired.

The llsetup.sh script will do the appropriate configuration based on
the config scripts that are passed.  For example:

llmount.sh == llsetup.sh local.cfg client-mount.cfg mds.cfg obdext2.cfg
llecho.sh  == llsetup.sh local.cfg client-echo.cfg echo.cfg
llmount-server.sh = llsetup.sh server-net.cfg mds.cfg obdext2.cfg
llmount-client.sh = llsetup.sh client-net.cfg client-mount.cfg

It is of course possible to combine several of the config files into a
single file for ease of typing, these ones are just the basics, e.g.

llsetup.sh peter.cfg
llsetup.sh adilger.cfg

By default it will also check in $HOME/.lustrerc for configuration before
parsing the specified config files.

None of the other scripts have been moved over to this config setup yet.

Still TODO: remote server setup