Bug 997711: don't use a proxy when puppetizing; r=whimboo

And add 'repos' and 'puppet' to the QA exception list, so that such
links will work after install.
bug 995951: please change my ssh key. r=dustin
Bug 967961: add python-dateutil prereq; r=bhearsum
No bug: send QA puppet mail to Henrik; a=orgonly