Update the binlog format parse routine to only be avaliable in 5.1 and allow...

Update the binlog format parse routine to only be avaliable in 5.1 and allow for any binlog_format to be specified

mysql-test/mysql-test-run.pl

@@ -732,20 +732,17 @@ sub command_line_setup () {
   $used_binlog_format= "stmt";
   if ( $mysql_version_id >= 50100 )
   {
-    $used_binlog_format= "mixed";
-  }
+    $used_binlog_format= "mixed"; # Default value for binlog format
+
     foreach my $arg ( @opt_extra_mysqld_opt )
     {
-    if ( defined mtr_match_substring($arg,"binlog-format=row"))
-    {
-      $used_binlog_format= "row";
-    }
-    elsif ( defined mtr_match_substring($arg,"binlog-format=stmt"))
+      if ( $arg =~ /binlog-format=(\S+)/ )
       {
-      $used_binlog_format= "stmt";
+	$used_binlog_format= $1;
       }
     }
     mtr_report("Using binlog format '$used_binlog_format'");
+  }
 
   # --------------------------------------------------------------------------
   # Check if we should speed up tests by trying to run on tmpfs