Do not attempt to catch uncatchable SIGSTOP

Eliminates a Valgrind warning:

==19239== Warning: ignored attempt to set SIGSTOP handler in sigaction();
==19239==          the SIGSTOP signal is uncatchable

Author: gaul

src/daemon.c

@@ -116,10 +116,6 @@ void signal_handler(int signal)
         syslog(LOG_WARNING, "Received SIGINT signal.");
         cleanup_and_exit(EXIT_SUCCESS);
 
-    case SIGSTOP:
-        syslog(LOG_WARNING, "Received SIGSTOP signal.");
-        cleanup_and_exit(EXIT_SUCCESS);
-
     default:
         syslog(LOG_WARNING, "Unhandled signal (%d) %s", signal, strsignal(signal));
         break;