## Problem
It took me a while to understand the purpose of all the tasks spawned in
the main functions.
## Summary of changes
Utilising the type system and less macros, plus much more comments,
document the shutdown procedure of each task in detail
In order to not to create NodePorts for each compute we can setup
services that accept connections on wildcard domains and then use
information from domain name to route connection to some internal
service. There are ready solutions for HTTPS and TLS connections
but postgresql protocol uses opportunistic TLS and we haven't found
any ready solutions.
This patch introduces `pg_sni_router` which routes connections to
`aaa--bbb--123.external.domain` to `aaa.bbb.123.internal.domain`.
In the long run we can avoid console -> compute psql communications,
but now this router seems to be the easier way forward.
