Fix #427, add valgrind support to to ubertests

Either add --valgrind-searchd for one-time run,
either add 'valgrindsearchd'=>true to .sphinx config file.
Suppression file test/valgrind.supp will be in game.

test/helpers.inc

@@ -371,11 +371,25 @@ function StartSearchd ( $config_file, $error_file, $pidfile, &$error, $use_watch
	$abs_error_file = testdir($error_file);
	$abs_pidfile = testdir($pidfile);

	$path = $g_locals['searchd'];
	if ( !is_executable($path) )
	if ( isset ( $g_locals['valgrindsearchd'] ) )
		$use_valgrind = $g_locals['valgrindsearchd'];
	else
		$use_valgrind = false;

	if ( $use_valgrind ) {
		$path = "valgrind --leak-check=full ";
		if ( file_exists("valgrind.supp" ) )
			$path .= "--suppressions=" . getcwd() . "/valgrind.supp ";
		$path .= $g_locals['searchd'];
	}
	else
	{
		$error = "$path: searchd not found";
		return 1;
		$path = $g_locals['searchd'];
		if ( !is_executable($path) )
		{
			$error = "$path: searchd not found";
			return 1;
		}
	}

	if ( !@touch($abs_error_file) )
@@ -417,6 +431,9 @@ function StartSearchd ( $config_file, $error_file, $pidfile, &$error, $use_watch
	if ($cd)
		chdir($backdir);

	if ( $use_valgrind )
		usleep ( 2000000 );

	// wait until pid appears
	for ( $i=0; $i<$action_retries && !file_exists($abs_pidfile); $i++ )
		usleep ( $action_wait_timeout );

test/ubertest.php

@@ -48,6 +48,7 @@
	print ( "--keep-all\t\tKeep test db and all test data (like generated configs, etc.) after the test (for debugging)\n");
	print ( "--no-demo\t\tJust skip all tests without models. Else - run them, but never fail (for debugging)\n");
	print ( "--no-marks\t\tDon't mark the output of every test in the logs.\n");
	print ( "--valgrind-searchd\t\tRun searchd under valgrind during test.\n");
	print ( "--ignore-weights\tIgnore differences in weights. (Useful for testing that reference database changes are ok.)\n" );
	print ( "--cwd\t\t\tchange directory to ubertest.php location (for git bisect)\n" );
	print ( "\nEnvironment variables are:\n" );
@@ -103,6 +104,7 @@
	else if ( $arg=="--test-thd-pool" )				$locals['use_pool'] = true;
	else if ( $arg=="--strict" )					$g_strict = true;
	else if ( $arg=="--strict-verbose" )			{ $g_strict = true; $g_strictverbose = true; }
	else if ( $arg=="--valgrind-searchd" )			$locals['valgrindsearchd'] = true;
	else if ( $arg=="--ignore-weights" )			$g_ignore_weights = true;
	else if ( $arg=="--no-drop-db" )				$locals['no_drop_db'] = true;
	else if ( $arg=="--keep-all" )					$locals['keep_all'] = true;