[master] refactor max-recursion-queries

- the counters weren't set correctly when fetches timed out.
  instead we now pass down a counter object.

bin/tests/system/reclimit/README

@@ -5,5 +5,7 @@ system test for recursion limits
 
 ns1  -- root server
 ans2 -- delegate to ns1.(n+1).example.com for all n, up to
-        the value specified in ans.limit
+        the value specified in ans.limit (or forever if limit is 0)
 ns3  -- resolver under test
+ans4 -- delegates every query to 16 more name servers, with "victim" address
+ans7 -- "victim" server