Bump the tester VM's RAM by 256 MiB.

There is not enough free RAM to run Tails Upgrader with just 1 GiB of
RAM after the migration to Wheezy.
Add I2P repo to the APT sources test.
Make test suite handle dhclient's random listener port.

That behaviour is new in Wheezy's dhclient.
Remove test suite steps that looks at notifications.

In Wheezy notifications are automatically hidden farily quickly, which
makes all such attempts error prone.
Make TrueCrypt test deal with the removal warning prompt.

This test has been incorrect since the removal prompt was added. No
part of the test tried to deal with the prompt, and the previous
TrueCryptWindow.png erroneously matched it, resulting in a false test
pass. The new one is made distinct enough to not match.
Update test suite images for Wheezy's appearance.
Do not purge bind9-host's dependencies.

We did that in Squeeze for unclear reasons (commit 129b6cf). My guess
is that it has to do with the bind9 Squeeze backport, and that some
other package pulled them, resulting in multiple versions of these
deps being installed. These particular versions are in Wheezy so now
they shouldn't be removed any more.
Fixup to commit d32bf5e.

One call of detected_ram_in_bytes was forgotten.
Always adjust OOM and memory overcommit settings.

The kernel freezes seem to also happen for the amd64 kernel when
filling the memory.
Update NM persistent connections dir.

It has moved in Wheezy.
Simplify.
The sticky bit is set for the device file in Wheezy.
Temporarily work around a t-p-s regression.

After running t-p-s the created container remains opened in Wheezy,
unlike in Squeeze. We simply close it for now so we don't have to
change the rest of the step too much.
Temporarily work around an APT regression.

If `APT::Default-Release` is set to `wheezy`, synaptic throws a fatal
error on startup.
Only wait for notifications to disappear.

In Wheezy's GNOME all notifications disappear quickly, so we don't
have to actively close them, which has proven to be a bit error prone.
Revert "Temporarily work around an APT regression."

This reverts commit 4c7bebadefd3cb47883a4f82806cca7428a667b9.

The original issue (#7055) has been fixed in commit 16f1170.
Add option to make Sikuli rety on FindFailed.

This makes it possible to update manu images for Sikuli in just *one*
test suite run, by continuously updating outdated pictures as we go.
Verify that the boot device is seen as system internal by udisks.