Fix irc server login

Summary: Previously, the identification string was thrown at the server long before you were connected, I've moved this to the end of the motd raw, and now errthangz gud

Test Plan: Register an account for your bot to use, give your bot the correct nick and password, then watch

Reviewers: epriestley

CC: aran

Differential Revision: https://secure.phabricator.com/D3410