Fixed mysql-test-run "Waiting ... seconds for pidfile" output

Now the output is only written every 60 second (as it used to be before my
latest change to sleep_until_file_created()).

mysql-test/lib/mtr_process.pl

@@ -109,6 +109,7 @@ ($$$$)
   my $warn_seconds = shift;
   my $sleeptime= 10; # Milliseconds
   my $loops= ($timeout * 10000) / $sleeptime;
+  my $message_time= 60;
 
   for ( my $loop= 0; $loop <= $loops; $loop++ )
   {
@@ -130,9 +131,10 @@ ($$$$)
     mtr_debug("Sleep $sleeptime milliseconds waiting for $pidfile");
 
     # Print extra message every $warn_seconds seconds
-    if ( $seconds > 1 && ($seconds*10) % ($warn_seconds*10) == 0 && $seconds < $timeout )
+    if ( $seconds >= $message_time)
     {
-      my $left= $timeout - $seconds;
+      $message_time= $message_time+60;
+      my $left= $timeout - int($seconds);
       mtr_warning("Waited $seconds seconds for $pidfile to be created, " .
                   "still waiting for $left seconds...");
     }