Bug 833864: Fix hg log output format and parsing. r=bhearsum
Bug 833864: Fix hg log output format and parsing. r=bhearsum

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extra : rebase_source : 836078b0ead9010a2a6f9c03d2dec5431eee0f07

lissyx/build-mozharness,armenzg/build-mozharness,lundjordan/mozharness,kartikgupta0909/mozilla-mozharness,simar7/build-mozharness,walac/build-mozharness,lundjordan/mozharness,escapewindow/mozharness,mrrrgn/build-mozharness,kartikgupta0909/gittest,kartikgupta0909/gittest,mozilla/build-mozharness,walac/build-mozharness,simar7/build-mozharness,kartikgupta0909/build-mozharness,mozilla/build-mozharness,kartikgupta0909/mozilla-mozharness,lissyx/build-mozharness,armenzg/build-mozharness,escapewindow/mozharness,mrrrgn/build-mozharness,kartikgupta0909/build-mozharness