fix bonjour mode and direct msrps connections

darcs-hash:20090303160910-b2873-cf0b74b1a0fb306c4b9706f8fa54db78c538c132
Session: remove reference to MSRPChat.is_initialized

darcs-hash:20090304152752-b2873-f306619081587a42cdcce27689e2ba2d2842b1f9