Policyd to Cluebringer 0.8.6 upgrade tutorial.

==== Required information ====
- iRedMail version: 0.8.5 - 5
- Store mail accounts in which backend (LDAP/):
- Linux/BSD distribution name and version: Centos 6
- Related log if you're reporting an issue:
====

Hello.

I hope everyone had a good holiday.

I am curious when the official upgrade tutorial will be out for 0.8.6 to upgrade Policyd to Cluebringer?