Create sheriff-o-matic.appspot.com.

This way we can move forward with using sheriff-o-matic, but have
the fallback of garden-o-matic if we encounter any bugs along the
way.

Eventually, we need to:
-merge this server with auto-sheriff.appspot.com.
-vulcanize the polymer widgets

NOTRY=true

Review URL: https://codereview.chromium.org/398813004

git-svn-id: svn://svn.chromium.org/blink/trunk@178491 bbb929c8-8fbe-4397-9dbb-9b2b20218538