kad: remove default IPFS DHT protocol name

[mxinden]

kad: remove default IPFS DHT protocol name

[robin-rrt]

This looks simple enough. I'd like to work on this. Can I be assigned?

[dariusc93]

Sounds like it can mimic what libp2p-identify does by defining a protocol name, though in this case it would be an array (unless this will be cut back to just be a single define protocol for libp2p-kad). Honestly, it sounds like a better idea than relying on the default.

[thomaseizinger]

though in this case it would be an array (unless this will be cut back to just be a single define protocol for libp2p-kad)

We added this back in #2837. I am wondering if we couldn't achieve the same thing by having multiple instances of libp2p_kad::Behaviour in your behaviour tree, all with a differently configured protocol name.