remove changeset types
https://gitlab.labs.nic.cz/labs/knot/merge_requests/66#note_813
KNOT_CHANGESET_TYPE_DNSSEC
@lslovak
This special type is not used anywhere. Is it necessary? On the other hand, it's probably nicer to have a special type...
@jkadlec
There are many types of changesets that are not used - the whole thing is rather obsolete - there's only one place in code where it makes any difference (DDNS vs IXFR I think)
@lslovak
Right, it should be quite obsolete, as all changesets should now be compatible with IXFR, so no special processing is required. The old code would, however, need some review in order to get rid of the types. Probably better to leave it that way for now.