Draft: Allow specifying DNS glue records when transferring, registering or updating domain names

[ajmyyra]

This PR implements name server glue record support requested in #2 . Currently still a draft as things need to be verified, but moving along.

Currently done:

• Glue record support along name server details, separated by comma (e.g. "ns1.domain.fi,1.2.3.4,1080:0:0:0:8:800:200C:417A"). Either v4, v6 or both can be given. With just a comma, we're adding just the hostName attribute (not sure why but RFC 5731 tells us that this is also an option, so why not).

Still TODO:

• Check that the FI domain EPP API actually returns these glue records as RFC claims and show them in the CLI tool.
• Support glue records in domain updates, so they can be added and removed
• Support glue records in domain transfers

[ajmyyra]

Most of the work is now done, but needs verification. Will continue with this.

[trackertrc]

Tested with trafi test suite.. when registering domain --ns option does not add any dns servers when registering domain this behavior is on the master version 1.0 same. but both versions can add and remove dns servers with update-ns so you should update the code in update-ns to allow --add-ns="dnsserver,ipv4,ipv6"