conf: ignore obsolete default-template-related options

src/knot/conf/conf.c

src/knot/conf/conf.h

src/knot/conf/tools.c

src/knot/ctl/commands.c

src/knot/dnssec/kasp/kasp_db.c

src/knot/server/server.c

src/utils/keymgr/main.c

tests/knot/test_journal.c

tests/knot/test_zone-update.c