The TailsOfflineDocHomepage.png image doesn't match what we see any
more (I have no clue why), so let's use Dogtail and solve this once
and for all, hopefully.

Refs: #12134

The idea is to enable:

 * users to report more useful bugs;
 * developers to better understand the failure we see in the test suite.

Fix-committed: #11853, #11850

It's required by openpgp-applet.

intrigeri authored Nov 10, 2016 and anonym committed Dec 21, 2016

Currently our devel branch FTBFS since Stretch got openpgp-applet 1.0,
that has a new dependency. For now let's revert to 0.9.1, that is the
version we installed before openpgp-applet 1.0 migrated to testing,
modulo "~bpo8+1". Ticket #11899 is there to track the upgrade to 1.0.

refs: #11899

When we skipped the 2.8 major release we didn't extend the 2016092002
snapshot's Valid-until.

Fix-committed: #12038

It contains fuser.

… in the hope that it tells us why the filesystem cannot be unmounted,
if this ever happens.

If the build tmpfs cannot be unmounted in practice, then the space it uses
remains as occupied cached memory, which fails the next build. So let's try
to *really* unmount it.

It must have been forgotten to bump the expiry of the 2016120401
snapshot since it now has expired.

Thanks, CVE-2016-1252!