Bug 830313 - manage_masters.py shouldn't croak if its a symlink when called. r=rail

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extra : rebase_source : d227996b9dbf4f2ffd23f1f947855441960ebf26
Bug 830316 - Print failures at the end of manage_masters.py - always. r=bhearsum

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extra : rebase_source : 8d910c887c9dbe1936592ec8669680f87a86a64b