[v9_9] RPZ speed up (phase 1, single RPZ)

[v9_9] RPZ speed up (phase 1, single RPZ)

3496.	[func]		Improvements to RPZ performance. The "response-policy"
			syntax now includes a "min-ns-dots" clause, with
			default 1, to exclude top-level domains from
			NSIP and NSDNAME checking. --enable-rpz-nsip and
                        --enable-rpz-nsdname are now the default. [RT #32251]

    Response policy (rpz) changes to
      - add zone statistics
      - speed up by adding min-ns-dots to the response-policy syntax
         with a default of 1
      - detect and reject policy zones with a database other than rbt
         only rbtdb has rpz hooks
      - allow empty response-policy{} statement
      - make --enable-rpz-nsip and --enable-rpz-nsdname the default