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Fixes to allow in-band registration.

Open B T requested to merge haael/slixmpp:registration_and_authentication into master

With the current implementation of SASL authentication, in-band registration (XEP-0077) will fail if it doesn't finish before the client is rejected.

This patch does the following:

  • A new 'SKIP' SASL mechanism is added, that simply does not send any credential. Registration plugin requests it when enabled.
  • Authentication processing blocks until it is finished, so registration does not race with it.
  • Registration stanza processing is moved after authentication, so the registration handler knows whether the authentication failed.

There are 2 ways of using the registration plugin:

  1. Authentication is performed first, and if it fails, registration is attempted. This is the default.
  2. Authentication is not performed, registration is attempted on the anonymous stream. To use it, add sasl_mech='SKIP' argument to ClientXMPP.__init__.