Substrate: --bootnodes should be able to accept just IP:port

[gavofyork]

... rather than requiring the public node key.

[tomaka]

I would suggest /ip4/x.x.x.x/tcp/x instead of ip:port, so that we can be generic over the multiaddress.

I also think a warning should be printed if the user doesn't specify the public key, because when doing so you can get man-in-the-middled.

[gavofyork]

for the purposes of UI, ip:port is still king and not supporting it would just lead to more support burden.

[gavofyork]

in other words, users don't care about multiaddress. they just want to Get Things Working.

[gavofyork]

support both though, if you like.