Created issue2550870 for the migration from rfc822 to the email module.

Adding issue869-better-test-20150225.diff which patches test_mailgw so that test function
that does a more thorough comparision of the email headers noticing more than one entry.
(But also case insensitivity differences.)

This finds the reported issue, but also additional ones e.g. MIME-Version seems to
be there twice sometimes.