Increase timeout while waiting for console/tty node to appear in the store:

the intention appears to have been 500msec, but struct timeval when used with
a select() is in usec, not msec.  The timeout has been set to 250msec (500msec
seems a little long, in any case).

Signed-off-by: Ewan Mellor <ewan@xensource.com>

tools/console/client/main.c

@@ -242,7 +242,7 @@ int main(int argc, char **argv)
 
 	now = time(0);
 	while (str_pty == NULL && (now + 5) > time(0)) {
-		struct timeval tv = { 0, 500 };
+		struct timeval tv = { 0, 250000 };
 		select(0, NULL, NULL, NULL, &tv); /* pause briefly */
 
 		str_pty = xs_read(xs, XBT_NULL, path, &len);