This commit takes care of making rabbitmq and redis work on a messaging
server. The configuration of gvaldap and gvaweb has been adapted to make
both applications work with actual running rabbitmq and redis.
This commit improves the gvaweb celery worker setup based on the work
that has been done for gvaldap before. Old files have been removed and
the setup uses the macros from gnuviechadmin/gvaapp_macros.sls.
