[xymon] External scripts for Xymon client on Xymon Server

The clientlaunch.cfg is in the client's etc dir, not the server etc dir. Logs / tmp files will be under the client dir too.

Example, on a hobbit server there are both $hobbithome/{server,client} dirs.

client/ext/na2.sh

[client/etc] tail clientlaunch.cfg

[NA2CPU] ENVFILE $HOBBITCLIENTHOME/etc/hobbitclient.cfg CMD $HOBBITCLIENTHOME/ext/na2.sh LOGFILE $HOBBITCLIENTHOME/logs/na2.log INTERVAL 2m

Tim