Bug#989581: autopkgtest: ADTTMP is now obsolete

[Simon McVittie]

On Fri, 20 Aug 2021 at 14:32:27 -0700, Sean Whitton wrote:
> I believe that it's been AUTOPKGTEST_TMP for a very long time now

Just over 5 years, FYI (autopkgtest 4.0, 2016-06-08).

    smcv