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fastexport: adjust output to be more canonical

Authored by joerg.sonnenberger.

Description

fastexport: adjust output to be more canonical

For time zones, git doesn't consider +0 and -0 the same timezone, so use
the former canonically. Add a test case to ensure that non-UTC offsets
are handled correctly. The real name part of the committer name is
normally not quoted, so don't enforce that.

Differential Revision: https://phab.mercurial-scm.org/D8522