Adds a local Autoupdate server and a mechanism for adding developer packages.

I've been getting frustrated by juggling usb sticks to constantly update my netbook so I wrote a simple
server that can run in a developer's source tree and serve updates to a netbook. I also added an upstart
task that will download a script from the dev server and run it. I use this to install sshfs, gdb, and vim.

Here's a quick heads up about what has changed. 

1. /etc/lsb-release

I added two new fields to the release file. One is the URL that should be pinged for updates. The other is the URL that can be used to download a developer setup script. 

2. chromeos_version.sh

The functionality for the release build is unchanged, however, developer builds now have a monotonically increasing version number. 

3. software-update.conf

Autoupdate is disabled when the DEV_SERVER field in /etc/lsb-release is initialized. This field won't be set on the build server, but will be set everywhere else. 

4. ping_omaha.sh

The omaha server is now configured by /etc/lsb-release

Review URL: http://chromereview.prom.corp.google.com/1175098

git-svn-id: svn://chrome-svn/chromeos/trunk@92 06c00378-0e64-4dae-be16-12b19f9950a1
diff --git a/buildutil.py b/buildutil.py
new file mode 100644
index 0000000..0ffb75f
--- /dev/null
+++ b/buildutil.py
@@ -0,0 +1,17 @@
+# Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+def GetPackages():
+  """
+    Lists all of the packages that can be built with a make_pkg.sh script.
+  """
+  pkgs = [] 
+  cli = os.popen("find %s -name make_pkg.sh" % root_dir).read().split('\n')
+  for pkg in cli:
+    if pkg == "":
+      continue
+    pkg_name = pkg.split('/')[-2]
+    web.debug(pkg_name)
+    li.append(pkg_name)
+