Doug Hellmann 08de5694b6 Make it possible to run zuul layout test locally
Add a tox environment to run the zuul layout tests locally.

Modify run-layout.sh to ignore a missing mirror selection script
and assume that it is running with a valid mirror configuration.
This allows the script to be run locally without breaking a
dev environment.

Change-Id: I5b0c94ae51e7f41b8b26b3ef4f78b830031d263e
2014-05-28 12:52:43 -07:00
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