Feature Request: add sanity checks to `hsw-cli` when adding/modifying `records`

Some of the data in the HNS root zone are "wrong", e.g., IP addresses being used as the name of NS RRs (instead of as the value of the RR).

i suggest that `hsw-cli` be extended to include a module that does a syntax/sanity check when `records` are created/modified, e.g., as in:

hsw-cli rpc sendupdate easyhandshake '{"records": [ ... ]}'

If you go to any DNS service that let's you edit RRs, they all perform such checks (or at least they should). I suggest taht `hsw-cli` do the same!