Feature request: Dynv6 work around record deletion issue

[nirizr]

1. What's the feature?
   For some unknown reason, dynv6 zone records occasionally "disappear". Probably as a result of a bug on their part.

2. Extra information?
   Previously I've used a bash script that alongside updating the IP also makes sure the record still exists or recreates it through their API.

Although this might be out of scope or closed as dynv6's responsibility, I thought this is a feature worth at least considering to add to ddns-updater as a workaround.