util: handle or ignore SIGPIPE signal

In chronyc handle SIGPIPE similarly to SIGTERM. In chronyd ignore the
signal to avoid crashing when a TCP socket will be needed (e.g. for
NTS-KE) and will be unexpectedly closed from the other side.

main.c

@@ -586,7 +586,7 @@ int main
   /* From now on, it is safe to do finalisation on exit */
   initialised = 1;
 
-  UTI_SetQuitSignalsHandler(signal_cleanup);
+  UTI_SetQuitSignalsHandler(signal_cleanup, 1);
 
   CAM_OpenUnixSocket();