#2942: OSG-RSV scripts need PATH in environment

With one user testing OSG-RSV, the scripts were not executable from
cron. The reason appears to be because perl cannot be found. The perl
scripts that are called from cron start with "#!/usr/bin/env perl".
Condor gives scripts executing a minimal path, but on one system, perl
could not be found. This results in errors like the following in
gratia-script-consumer.log:

021 (017.000.000) 08/23 13:52:42 Error from starter on
<131.225.166.21:34471>:
Failed to execute
'/usr/local/vdt-1.8.0/osg-rsv/bin/consumers/gratia-script-consumer' with
arguments /usr/local/vdt-1.8.0/osg-rsv/logs/consumers/: Permission denied


When configure_osg_rsv is called, it will now try to determine where
perl is, and pass this in the PATH environment variable to the scripts.