LP1204123 Improved per-service control (C/Perl)

LP1204123 Improved per-service control (C/Perl)

C opensrf no longer mantains a single master process.  Instead, like
Perl, each Listener process writes its own PID file and can be managed
individually.  Related to this, much code was cleaned up in
osrf_system.c.

osrf_ctl.sh now has the ability to stop/start individual services for
Perl and C, using the new -s <service> option.  Examples:

osrf_ctl.sh -l -a restart_c -s opensrf.math
osrf_ctl.sh -l -a restart_perl -s opensrf.settings

Signed-off-by: Bill Erickson <berick@esilibrary.com>