now really working, due to domain/zone ids and support for ANY
now really working, due to domain/zone ids and support for ANY

* also content support for NS
* changed store keys (but we're in alpha, so who cares ;))

for now we have to put extra records for NS server IPs (glue records) outside of the auth tree of the zone
e.g. for example.net, nameserver ns.example.net, two entries needed:
.../example.net/ns/A/xxx => '192.168.0.1' (in auth tree)
.../ns.example.net/@/A/xxx => '192.168.0.1' (out of auth tree)

nixn/pdns-etcd3