[Integrated] RFR: Add support for adding extra headers to mails sent to mailing lists

[duke]

Changeset: 15376a9a
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2019-09-24 10:28:10 +0000
URL:       https://git.openjdk.java.net/skara/commit/15376a9a

Add support for adding extra headers to mails sent to mailing lists

Reviewed-by: ehelin

! bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/ArchiveWorkItem.java
! bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/MailingListBridgeBot.java
! bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/MailingListBridgeBotFactory.java
! bots/mlbridge/src/test/java/org/openjdk/skara/bots/mlbridge/MailingListArchiveReaderBotTests.java
! bots/mlbridge/src/test/java/org/openjdk/skara/bots/mlbridge/MailingListBridgeBotTests.java