Bug 866260 - cut over build/* repos to the new vcs-sync system,r=aki,r=hwine

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extra : source : c84a7b30ebf709447e36832988bdb84f3c454845
Bug 966441 - Fix windows and mac configs to define all_mozbase_suites; r=jlund
Bug 974093 - Upload qemu.log to blobber, r=jgriffin
Merge bugs 866260, 966441, and 974093 to production.

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branch : production