fix: call Stop on all other signals to correctly set the server state for the shutdown procedure to complete successfully

* possibly fixes: #979

signals_unix.go

@@ -24,9 +24,11 @@ func (srv *Server) waitForSignals() {
 		if sig == unix.SIGTSTP {
 			srv.Stop()
 			continue
-		}
+		} else {
+			srv.Stop()
 			break
 		}
+	}
 }
 
 func (s *Scheduler) waitForSignals() {