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tests: handle In-Reply-To headers for line wrapping

Authored by joerg.sonnenberger.

Description

tests: handle In-Reply-To headers for line wrapping

Python 3 tends to insert a newline for both Message-ID and In-Reply-To
headers, so unwrap both. Just check the wrapped line format explicitly
without regular expression.

Differential Revision: https://phab.mercurial-scm.org/D8171