xenstored: print domain id in traces

It is very helpful to see domain id why analyzing xenstored
traces. Especially when you are trying to understand which exactly
domain performs an action.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
[jgrall: Use %u rather than %d]
Signed-off-by: Julien Grall <jgrall@amazon.com>

tools/xenstored/core.c

@@ -135,8 +135,8 @@ static void trace_io(const struct connection *conn,
 	now = time(NULL);
 	tm = localtime(&now);
 
-	trace("io: %s %p %04d%02d%02d %02d:%02d:%02d %s (",
-	      out ? "OUT" : "IN", conn,
+	trace("io: %s %p (d%d) %04d%02d%02d %02d:%02d:%02d %s (",
+	      out ? "OUT" : "IN", conn, conn->id,
 	      tm->tm_year + 1900, tm->tm_mon + 1,
 	      tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec,
 	      sockmsg_string(data->hdr.msg.type));