dual-stack-servers are not being used
The current code for deciding when to add a dual stack server doesn't always cause the server to be added as it is looking for a NXRRSET indication for the server's address (A for IPv4 and AAAA for IPv6) as well as no dispatch for that transport. When the server is within the zone we can't get the NXRRSET indication. Additionally no dispatch is contingent on -4 or -6 being used on the command line.
- We need a solution to the bootstrap problem or to relax the requirement.
- We need a better solution for how to determine we are effectively running single stack other the -4 and -6.
- We need to add tests for dual-stack-servers as there are currently none.