IPMatcher: failing tests referring to nairi.desy.de

in 2.6 and 2.2 one unit tests relies on nairi.desy.de to have a DNS
entry. Since this is no longer the case, the tests now fail.
This patch substitutes the address with more long living DNS entries
that will most probably outlive 2.2 and 2.6.

Acked-by:
Target: 2.2
Target: 2.6
Require-book: no
Require-notes: no
Merge pull request #363 from kschwank/fix/nairi/2.6

Fix/nairi/2.6