HAX: email: Workaround FDO's header mangling

FDO started respecting DMARC, which means it cannot freely resend emails
without rewriting 'From:' header in some cases.

So this:
  From: Author <original@mail>
Changes to:
  From: Author via listname <listid@lists.freedesktop.org>
  Reply-To: Author <original@mail>

Let's recognize that and unmangle it for authorship and mbox purposes.

Signed-off-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
1 job from master in 3 minutes and 21 seconds (queued for 1 minute and 7 seconds)
Status Job ID Name Coverage
  Test
passed #113735
test

00:03:21