Expected to have regressed after https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1008

This patch comes with its own downsides (as described in the comments
for matrix_prometheus_node_exporter_container_http_host_bind_port),
but at least there's:
- no security issue
- metrics remain readable from matrix-prometheus (even if the network metrics are inaccurate)

A better patch is certainly welcome.

This reverts commit 68ca81c8c2.

Supposedly fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/907

Initial attempt. Seems to work fine.

Only tested on debian amd64 so far