Handle placeholder KEYDATA record
A placeholder keydata record can appear in a zone file. Allow them to be read back in.
(cherry picked from commit c6fa8a1d)
Closes #2686 (closed), #2728 (closed), #2769 (closed)
Edited by Michał Kępień
A placeholder keydata record can appear in a zone file. Allow them to be read back in.
(cherry picked from commit c6fa8a1d)
Closes #2686 (closed), #2728 (closed), #2769 (closed)