Bug#931566: Don't complain about suite changes (Acquire::AllowReleaseInfoChange::Suite should be "true")

[Christoph Berg]

Control: tags -1 buster sid

Re: To Debian Bug Tracking System 2019-07-07 
<20190707183910.ga22...@msg.df7cb.de>
> Please consider setting Acquire::AllowReleaseInfoChange::Suite "true";

Fwiw, I think this needs fixing in buster, not just in unstable.

Christoph