1.0.2dev: make sure git tests pass even without author info (#11045)
Set the user.name and user.email in the config of the test repo, and while at it, use a unicode name and test it's correctly read back.
Also, show stderr output in case of failure of a git command, to ease debugging.
Authored by: cboos 2013-02-03
Parent: [r11674]
Child: [r11676]
