Add NTA persistence (#37087)
4034. [func] When added, negative trust anchors (NTA) are now saved to files (viewname.nta), in order to persist across restarts of the named server. [RT #37087]
4034. [func] When added, negative trust anchors (NTA) are now saved to files (viewname.nta), in order to persist across restarts of the named server. [RT #37087]