Bug 1011700 - add mochitest-browser, mochitest-a11y and mochitest-chrome synonyms to try syntax, r=bhearsum
bug 1011292 - change how desktop_unittest is chunked. r=jlund

--HG--
extra : rebase_source : 97bca0a070ef774d4f67105220bb595245da9e80
bug 875164 - kill b2g18+1.1hd. r=rail
Bug 1014318: Fix how we're using deepcopy to override symbols downloads for debug tests. r=aki

The current code actually changes the object branch_config refers to for
subsequent passes though the code.

It's more correct to modify branch_config to force the symbol downloading
settings to be what we want.
Bug 1014318: Removing usused code r=aki
Bug 1014212 - Remove the need to touch more than buildbot-configs when adding a new platform. r=catlee