Rename roll-dep to roll-dep-svn and add roll-dep for git.

It is inspired by src/tools/roll_swarming_client.py but generalized.

R=dpranke@chromium.org, stip@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1147033003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@295386 0039d316-1c4b-4281-b951-d872f2087c98

roll-dep-svn

+#!/usr/bin/env bash
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+base_dir=$(dirname "$0")
+
+PYTHONDONTWRITEBYTECODE=1 exec python "$base_dir/roll_dep_svn.py" "$@"

roll-dep-svn.bat

+@echo off
+:: Copyright (c) 2012 The Chromium Authors. All rights reserved.
+:: Use of this source code is governed by a BSD-style license that can be
+:: found in the LICENSE file.
+
+:: This is required with cygwin only.
+PATH=%~dp0;%PATH%
+
+:: Defer control.
+%~dp0python "%~dp0\roll_dep_svn.py" %*