LP1204123 osrf_ctl.sh supports sending signals

LP1204123 osrf_ctl.sh supports sending signals

Using the following new options to osrf_ctl.sh, the script can now send
signals to any/all OpenSRF Listener processes:

-a signal / signal_all
-k <signal> [value passed to 'kill -s']
-s <service>

With an action of 'signal' and service provided by -s, the specified
signal is sent only to the listener process of the service.

With an action of 'signal_all', the specified signal is sent to all
listener prcesses.

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