mod_sasl2_bind2, mod_sasl2_sm: Remove bind2 <features/> wrapper element
This was dropped from the spec. It's more consistent with SASL2.
# Introduction
This module exposes users [microblogging][xep277] on Prosodys built-in HTTP server.
# Usage
With default HTTP settings, the microblog of `user@example.com` would be
seen at `https://example.com:5281/atom/user`.
# Configuration
The module itself has no options. However it uses the access control
mechanisms in PubSub, so users must reconfigure their microblogging node
to allow access, by setting `access_model` to `open`.
E.g. Gajim has UI for this, look for "Personal Events" → "Configure
services".