Linux start script updates

Due to a thread about the neglect of the sample start scripts I took a
look at the current Linux file.  There's certainly room for several
improvements, but some of them might require discussion.  Attached are
a couple small changes which seem to me to be pretty tame.  Hopefully
a small, non-controversial step in the right direction.
 
(1)  It adds an LSB INIT INFO comment block, consistent with the
chkconfig comment block above it.
 
http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/initscrcomconv.html
 
(2)  It doesn't exit with zero for a missing executable unless the
request is "stop".  It uses 5, which means "program is not installed".
 
http://refspecs.freestandards.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
 
-Kevin