#2941: Set more information in urCollector.conf (configure_gratia)

configure_gratia should set PbsAccountingDir and LsfAccountingDir in
urCollector.conf for the PBS and LSF probes.

Chris Green tells me that Globus collects this information when it
configures the SEG. For example, setup-seg-pbs.pl does it for PBS. It
can be found in $VDT_LOCATION/globus/etc/globus-pbs.conf and looks like
this:

log_path=/var/spool/pbs/server_logs

For LSF, it is in $VDT_LOCATION/globus/etc/globus-lsf.conf and looks the
same in the file.

Alain has some understanding of all this and can hopefully dig into it
if someone else doesn't get to this ticket first.

The SEG isn't necessarily installed, so these should only be set in the
urCollector.conf if they are known. If they are not known, we should
tell users to set them by hand in the post-install/README file. ("The
Gratia probe needs this to work, so set it in ...")