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.
This commit refactors to gnuviechadmin.base state by moving the Django
specific parts into gnuviechadmin.django that is now used by
gnuviechadmin.gvaldap and gnuviechadmin.webinterface. The script
templates gnuviechadmin/gvafile/run_celery.sh and
gnuviechadmin/gvafile/settings.sh have been added.