Don't log ipv6 warning

[JoNil]

In my application i get this warning on startup, we expose the log to our user and it is not acceptable for us to spam the user with warnings.

If you don't want to accept this as is there are two other alternatives that i see. We could add a verbose flag that logs this warning or we could add an option to only start in ipv4 mode and then this could be a hard error if you ask for ipv6.

I could implement one of those options if you would like.

[willstott101]

My intention with many of the log lines is that dependent executables could use the available metadata to filter log messages to what they deem suitable (librespot does this) - as it's unlikely we could ever please everybody. However... complaints about log verbosity keep coming up - so I wonder if it'd be best to just have a compile-time feature to completely disable logging or something.

Regardless I'd be willing to downgrade this message from warn to info if that might work for you - seems a shame to throw away the error message completely.

[ashthespy]

On a tangent, turning off ipv6 in such a case might help? (#8)

[willstott101]

Closing this as there are several other solutions. If you care deeply about the log messages you show - I think you filtering in your app might be a good idea.

Even so, a new PR to add an option to disable IPv6 would be accepted, as would a PR to reduce the log level of this particular log line. Thanks