network: Authoriy discovery records published without IP addresses

We have an unusual number of warnings from litep2p running 0.6.2 in kusama as validators.

The warnings are hamless, however they expose an underlying issue wrt publishing authority discovery records in DHT:

WARN tokio-runtime-worker sub-libp2p: couldn't add known address (/p2p/12D3KooWFie68KdEbjkqtHgzkWA4MfbnUYipqBQHXtheydcuPKG7) for PeerId("12D3KooWFie68KdEbjkqtHgzkWA4MfbnUYipqBQHXtheydcuPKG7"), unsupported transport

Using subp2p-explorer tool to discover authorities, some authorities are publishing empty addresses of the form: /p2p/[peer ID]:

authority="CzHcp6nEsT4NJuAbf4yCS2J8KKYpvuAe63bkWrPWhjaaT6w" 

peer_id=PeerId("12D3KooWFegWJubWCeJCbWpDEAwukQmXKaWTyRgRRZ8NNdzmuxSr")

version="Parity Polkadot/v1.16.1-835e0767fe8 (staked-eu-north-1-472-a)"

addresses={.., /p2p/12D3KooWFegWJubWCeJCbWpDEAwukQmXKaWTyRgRRZ8NNdzmuxSr, ..}

The previous version corresponds to `v1.16.1-rc2.

(1) Ensure the authority-discovery mechanism does not publish /p2p/[peer ID] addresses as they provide no IP information to connect to the authority
(2) Do not attempt to register empty addresses in litep2p backend

cc @paritytech/networking

paritytech / polkadot-sdk

network: Authoriy discovery records published without IP addresses #6518