Since the introduction of libqt-jami deb packages, they were built
using quite an ugly hack on the Jenkins side.  This patch reworks all
of that so that libqt-jami is built for each distro version if it was
not already previously built, or if a force rebuild is specified.

Change-Id: Ib74b747628a007cd0d61b068e0ff9ed80006b93d