[Nmh-workers] Buildbots switched to 1.6-release branch.

[Lyndon Nerenberg]

The buildbot cluster is now building against the 1.6-release branch.  I have 
also increased the git repo polling frequency to every 10 minutes.  Presumably 
the builds will now trigger off commits (only) to the release branch, but I can 
verify that until I see a few commits to the branch and the head go through.  
David, Ken, and I can use The Force if need be.

--lyndon

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