Use the same PID directory as the opensrf-perl.pl and opensrf.py scripts

Use the same PID directory as the opensrf-perl.pl and opensrf.py scripts

The default PID directories for the opensrf-perl.pl and opensrf.py scripts
was /openils/var/run/opensrf (assuming a prefix of '/openils'), while the
default PID directory for osrf_ctl.sh was /openils/var/run. This complicated
matters when trying to restart individual Python or Perl services, as without
passing an explicit PID directory argument the restart command from the
language-specific script would check for a PID in a different PID directory,
find none, and end up running a second copy of the service instead of
restarting the existing service.

The change groups all PIDs in the 'run/opensrf' subdirectory to avoid any
PID file conflicts (as unlikely as that might be) if OpenSRF is installed
in the default location - so rather than /var/local/run/*.pid, one will
be able to look at /var/local/run/opensrf/*.pid

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@2075 9efc2488-bf62-4759-914b-345cdb29e865