This was fixed in 1.13.1~rc1-0ubuntu1. See changelog:
[ James Page ] ... * d/container-server.conf: Add missing container-sync section (LP: #1290813).
This was fixed in 1.13.1~ rc1-0ubuntu1. See changelog:
[ James Page ] server. conf: Add missing container-sync section
...
* d/container-
(LP: #1290813).