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>
2 jobs for unmangle_fdo in 6 minutes and 35 seconds (queued for 59 seconds)
Status Name Job ID Coverage
  Containers
passed containers:patchwork-testing #113695

00:04:27

 
  Test
passed test #113696

00:02:07