Write the PID file from the child process (the one that launches the

Write the PID file from the child process (the one that launches the
listeners), not from the parent process; and only if it actually launches
a listener.

Otherwise if there are no C apps to launch, the child would die immediately,
leaving the PID file hanging around to confuse the surrounding shell script.

M    src/libopensrf/osrf_system.c

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1954 9efc2488-bf62-4759-914b-345cdb29e865