Should listen to ports right after finding right amount of servers

[7c]

Imagine following scenario:

• linux host is under censorship country
• public-resolvers contains over 100+ public-resolvers, somehow the .md file is shipped alongside the configuration as cache
• because we dont know which servers are blocked or will be blocked soon, we cannot set 'server_names' parameter, so leaving it empty will start a 'network test'
• the 'network tests' takes 6 full minute and around 40 possible working servers found
• then DNSCrypt starts listening to mentioned port(s) and outputs 'dnscrypt-proxy is ready - live servers: 40'

in such a setup those 6 minutes server will be without resolv. It should be possible to change the lb strategy to something like 'quick4' where it launches the listen operations after finding 4 servers. I could not find such a feature. We do not know which servers will be blocked next hours, so keeping 'server_names' not set is only option to find server

[jedisct1]

The proxy starts responding to queries as soon as one server is responsive, no matter how many other servers are left.