jenkins: Install Build Publisher plugin

This plugin allows records from one Jenkins to be published on another Jenkins.
The typical use case is for you to run builds within the firewall, then send
the results to another Jenkins which is facing the outside world.

Task-number: QTQAINFRA-783
Change-Id: I93f2c204e8b34fb7510e1913b2df03346302904b
Reviewed-by: Simo Fält <simo.falt@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Reviewed-by: Heikki Halmet <heikki.halmet@digia.com>