James E. Blair 17cde1fd06 Install Zuul onto workers
So that we can use zuul-cloner, install Zuul into a venv.  We can
invoke it with /usr/zuul-env/bin/zuul-cloner.

Change-Id: Id97b967cea2d3e476334f51525a036c7c7e43762
2014-08-27 07:40:42 -07:00
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