Extend DNAME DNSSEC tests
This MR contains a few commits which were originally part of isc-private/bind9!39 that were not directly associated with #771 (closed) and thus were left out from that MR.
Edited by Mark Andrews
This MR contains a few commits which were originally part of isc-private/bind9!39 that were not directly associated with #771 (closed) and thus were left out from that MR.