[Superseded by !5704] Remove the workaround for broken handling of NOTIFY with SOA
requested to merge 3086-remove-workaround-for-server-mishandling-notify-with-soa-record-in-answer-section into 3084-dont-schedule-zone-refresh-when-shutting-down
In 2000, old BIND instances (BIND 8?) would return FORMERR if the SOA is
included in the NOTIFY.
Remove the workaround that detected the state and resent the NOTIFY
without SOA record.
Closes #3086 (closed)
[This MR was not merged into main, see a comment below.]