Bug #12365486 MTR FAILS TO FIND WARNINGS IN SERVER LOG WITH --VALGRIND COMBINED WITH --DEBUG

With this combination, outoput was directed to .trace but not all
  parts of MTR was aware of this.
Replace .err with .trace at the earliest possible place

mysql-test/lib/My/ConfigFactory.pm

 # -*- cperl -*-
-# Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Library General Public
@@ -141,7 +141,11 @@ sub fix_tmpdir {
 sub fix_log_error {
   my ($self, $config, $group_name, $group)= @_;
   my $dir= $self->{ARGS}->{vardir};
-  return "$dir/log/$group_name.err";
+  if ( $::opt_valgrind and $::opt_debug ) {
+    return "$dir/log/$group_name.trace";
+  } else {
+    return "$dir/log/$group_name.err";
+  }
 }
 
 sub fix_log {

mysql-test/mysql-test-run.pl

@@ -256,7 +256,7 @@ my $opt_strace_client;
 
 our $opt_user = "root";
 
-my $opt_valgrind= 0;
+our $opt_valgrind= 0;
 my $opt_valgrind_mysqld= 0;
 my $opt_valgrind_mysqltest= 0;
 my @default_valgrind_args= ("--show-reachable=yes");
@@ -4544,13 +4544,6 @@ sub mysqld_start ($$) {
   unlink($mysqld->value('pid-file'));
 
   my $output= $mysqld->value('#log-error');
-  if ( $opt_valgrind and $opt_debug )
-  {
-    # When both --valgrind and --debug is selected, send
-    # all output to the trace file, making it possible to
-    # see the exact location where valgrind complains
-    $output= "$opt_vardir/log/".$mysqld->name().".trace";
-  }
   # Remember this log file for valgrind error report search
   $mysqld_logs{$output}= 1 if $opt_valgrind;
   # Remember data dir for gmon.out files if using gprof