Remove unneeded test variants changes
    
    Variants for testing were planned to test also named-sdb and
    named-pkcs11 builds. Instead, those build were deprecated, named-sdb no
    longer exists with possible replacement of named-dlz plugins.
    named-pkcs11 would not be built soon, it can be replaced by using -E
    pkcs11 parameter to named and some dnssec-* tools. Testing those
    variants should not be required this way.