'Send a MSG_USERAUTH_REQUEST.
@param kind: the authentication method to try.
@type kind: L{bytes}
@param extraData: method-specific data to go in the packet
@type extraData: L{bytes}'

def askForAuth(self, kind, extraData):

    self.lastAuth = kind
    self.transport.sendPacket(MSG_USERAUTH_REQUEST, (((NS(self.user) + NS(self.instance.name)) + NS(kind)) + extraData))
