[Debian-rtc-admin] Upgrading Vogler to buster

[Martin]

Quoting gustavo panizzo via Debian-rtc-team  
<debian-rtc-team at alioth-lists.debian.net>:
> I'd like to upgrade vogler to buster to take advantage of a newer
> prosody version, when it is backported to buster, and for general
> awesomeness in buster :)

I upgraded my company prosody container from stretch to buster
some time ago and do not remember any problems. Let's upgrade!