Tweak, fix, and add tests so every tool passes.

t/pt-sift/pt-sift.t

@@ -0,0 +1,24 @@
+#!/usr/bin/env perl
+
+BEGIN {
+   die "The PERCONA_TOOLKIT_BRANCH environment variable is not set.\n"
+      unless $ENV{PERCONA_TOOLKIT_BRANCH} && -d $ENV{PERCONA_TOOLKIT_BRANCH};
+   unshift @INC, "$ENV{PERCONA_TOOLKIT_BRANCH}/lib";
+};
+
+use strict;
+use warnings FATAL => 'all';
+use English qw(-no_match_vars);
+use Test::More tests => 1;
+
+use PerconaTest;
+
+TODO: {
+   local $TODO = "Test pt-sift";
+   ok(1, 'ok');
+};
+
+# #############################################################################
+# Done.
+# #############################################################################
+exit;