LP#1204123 osrf_control warn and exit on bad host

LP#1204123 osrf_control warn and exit on bad host

Any time a start action is issued (start, start_all, restart,
restart_all), osrf_control will first verify that the selected hostname
(or localhost) hosts the requested service(s).  If not, the user is
warned and the script exits before any action is taken.

Note: we do not make a similar verification for stop and signal actions,
since those may be reasonably be used even when a service is not
configured to run on the selected host.

Thanks to Jason Stephenson for the suggestion.

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