of_daemon::kill: don't throw exception on failure
of_daemon::kill: don't throw exception on failure

Just return false if we couldn't kill the daemon.  Don't throw an
exception.  Also remember to return True if we could kill the daemon.

Signed-off-by: Colin McCabe <3142ce8a0bdba4a38073365893e6b74f72d9c512@alumni.cmu.edu>

cmccabe/redfish,cmccabe/redfish,cmccabe/redfish,cmccabe/redfish,cmccabe/redfish