Red Hat has alternative variant builds of named, which are not ever
tested by system tests. New variables make it relatively easy to test
alternative variants.
For sdb variant use:
export NAMED_VARIANT=-sdb DNSSEC_VARIANT=
For pkcs variant use:
export NAMED_VARIANT=-pkcs11 DNSSEC_VARIANT=-pkcs11
followed by make test in build directory.
Note: PKCS11 tests are still skipped, it requires SLOT variable
exported. Fails in some cases.
