Bug 1036821 - git commit hash isn't wrote to settings/resources/gaia_commit.txt on Windows
Bug 1039739 - Add some logging when writing the git commit id into the settings app;r=yurenju
Bug 1039739 - Make it more clear what command we're executing;r=yuren
Bug 1036821 - execute git by shell if we got error from subprocess module
Merge pull request #22147 from yurenju/settings-git-commit-win

Bug 1036821 - git commit hash isn't wrote to settings/resources/gaia_commit.txt on Windows r=@cctuan