add user vars file, variables for n of receivers and brokers

deploy/docker/cluster/asapo-start

deploy/docker/cluster/asapo_overwrite_vars.tf

deploy/docker/cluster/run_maxwell.sh

deploy/docker/cluster/scripts/asapo-brokers.nmd.tpl

deploy/docker/cluster/scripts/asapo-receivers.nmd.tpl

deploy/docker/cluster/scripts/asapo.auto.tfvars.in

deploy/docker/cluster/scripts/templates.tf

deploy/docker/cluster/scripts/vars.tf