Many servers do not send a meaningful hostname in 001

This was found during troubleshooting #286. On at least hybrid, perhaps other ircds, the 001 message does not include a meaningful hostmask for the user. This means that the max message length calculation is incorrect. We'll need to find a way to correctly calculate the value, possibly by issuing a WHOIS self.nick, likely in a registered event handler or something similar. I have seen a number of bots do this, and I know irssi does it at least. @jirwin, thoughts?

[Trinitas]

It says 001 message text used varies widely. Strange that people didn't mentioned this earlier.

[philip-peterson]

We could do an rDNS lookup initially just to get a good guess, then if the server doesn't provide a good hostmask, do a WHOIS, perhaps?

This is not closed, PR #386 was merged so this should be closed?

[LinuxMercedes]

PR #386 hasn't been merged yet.

[jirwin]

Fixed #386