[K12OSN] more refined purge_user hacks

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I've been playing around with different ways of removing a user's processes
before they login and when they log out. This is still a work-in-progress,
but it is less of a hack than the last version.

This is still experimental, use at your own risk (and the risk is high!)

Attached are two scripts, gdm-kdm-purge-user.sh and purge_user. Drop
purge_user in /usr/sbin/  and run the gdm-kdm-purge-user.sh script.
The gdm-kdm-purge-user.sh script will configure both GDM and KDM to 
call the /usr/sbin/purge_user script whenever someone logs in or out.
It also creates a new config file /etc/sysconfig/k12ltsp.

The /usr/sbin/purge_user script can be called from the command line, just
run "/usr/sbin/purge_user username"  and all of "username's" processes 
will be removed from the system.

The purge_user script defaults to NOT executing from GDM/KDM. To enable
this feature, edit /etc/sysconfig/k12ltsp and set:

	PURGE_PROCESSES=YES


One important thing that I'm missing is an exception list. There should
be a way to specify user's who are allowed to login more than once or
to leave processes running in the background when they log out.


Since these changes are fairly simple and default to being inactive, 
I'll probably add them to the ltsp_config package in the next K12LTSP
build.

-Eric

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