allow dynamic addition and deletion of zones.
			To enable this feature, specify a "new-zone-file"
			option at the view or options level in named.conf.
			Zone configuration information for the new zones
			will be written into that file.  To make the new
			zones persist after a restart, "include" the file
			into named.conf in the appropriate view.  (Note:
			This feature is not yet documented, and its syntax
			is expected to change.) [RT #19447]