test/avl: Reduce test AVL tree size.

So that the testsuite doesn't take forever on slower machines.

Reported-by: Christian T. Steigies <cts@debian.org>
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Merge branch 'patched' into debian
debian/changelog: Added 0.36.2-2 news

Signed-off-by: Gergely Nagy <algernon@balabit.hu>