Tinderbox HEAD, tinderd, and a further proposed patch

[Ade Lovett]

As promised a while back, I have now reincorporated all of the  
tinderd functionality that was removed from HEAD back in place -- I'm  
pretty certain I've got everything sorted, but testing and bug  
reports are certainly welcomed.

One final piece of work before I take another hiatus from tinderbox  
development can be found at:

http://freebsd.lovett.com/patches/tb-update.diff

This is a fairly heavy-duty reworking of the update code for both  
jail and portstree sources.  Instead of the variety of hacks we have  
now, the important part to both createJail and createPortsTree is the  
following stanza:

	-u CSUP|CVSUP|USER|NONE

in the first two cases, an appropriate supfile is generated, and a  
{jails,portstrees}/<name>/update.sh script is created.  In the second  
case, it is assumed that the relevant update.sh script is already  
present (eg: for cvs updating from a local repository).  In the final  
case, for completeness sake, the jail or portstree source is assumed  
to be static, and no updating occurs.

When the jail/portstree is now updated, the execution simply becomes  
".../update.sh > update.log", significantly reducing the complexity  
of tc_command.{sh,pl}

As with the other code, I'd appreciate feedback on this, before I  
commit it to HEAD (I have no plans to do an MFH myself, given the  
divergence of the codebase).

-aDe