Code review comment for lp:~edwin-grubbs/launchpad/bug-430708-registry-windmill-layer

Summary
-------

Moved the test_timeline_graph.py to lib/lp/registry/windmill
and made the changes necessary to have it run by ./bin/test
instead of ./bin/lp-windmill.

I added very kludgy looking for-loops to the tests to eliminate
sporadic failures that were occuring from 5% to 10% of the time.

Tests
-----

./bin/test --layer=RegistryWindmillLayer

Demo and Q/A
------------

Not QA-able.

Lint
----

= Launchpad lint =

Checking for conflicts. and issues in doctests and templates.
Running jslint, xmllint, pyflakes, and pylint.
Using normal rules.

Linting changed files:
  Makefile
  lib/lp/registry/windmill/testing.py
  lib/lp/registry/windmill/tests/test_timeline_graph.py