[Integrated] RFR: mirror-bot: support mirroring of selected branches

[Erik Helin]

Changeset: 1ad79ab5
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2020-03-24 12:35:34 +0000
URL:       https://git.openjdk.java.net/skara/commit/1ad79ab5

mirror-bot: support mirroring of selected branches

Reviewed-by: rwestberg

! bots/mirror/src/main/java/org/openjdk/skara/bots/mirror/MirrorBot.java
! bots/mirror/src/main/java/org/openjdk/skara/bots/mirror/MirrorBotFactory.java
! bots/mirror/src/test/java/org/openjdk/skara/bots/mirror/MirrorBotTests.java