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.

client.c

@@ -3258,7 +3258,7 @@ main(int argc, char **argv)
     hostnames = DEFAULT_COMMAND_SOCKET",127.0.0.1,::1";
   }
 
-  UTI_SetQuitSignalsHandler(signal_handler);
+  UTI_SetQuitSignalsHandler(signal_handler, 0);
 
   sockaddrs = get_sockaddrs(hostnames, port);