Also retire support for the MINIX versions of /etc/hosts and
/etc/resolv.conf. These files will be brought back with NetBSD
imports, although like NetBSD, MINIX 3 will be using external
resolvers directly from then on. Since resolv.conf is hand-created
rather than installed, we do not mark it as obsolete.
Change-Id: Ie6154d5a4d8d977c19b9754bf920ae868680e9d1