Fix git tests to work regardless of global gitconfig.
Previously if one or both of these values were unset, the tests would simply fail because `git config` returns 1. R=dpranke@chromium.org BUG= Review URL: https://chromiumcodereview.appspot.com/18053009 git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@208966 0039d316-1c4b-4281-b951-d872f2087c98
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