Log Message:
Update ejabberd to 14.12.

ejabberd Community 14.12 includes many bugfixes, and a few new features:
- New module mod_client_state implements XEP-0352: Client State Indication
- New module mod_fail2ban to ban IPs that show malicious signs
- New option store_empty_body in mod_offline
- New option disable_sasl_mechanisms
- Improve option resend_on_timeout to support if_offline
- More robust offline server
- Better charset support in XMLRPC
- Some PEP issues fixed