* plugin/dnssec: add per server metrics
final plugin.
Fixes#1696#1492#1189
* Move cache cap into handler so we can access the server label
* Remove cache-capacity from it entirely
* plugin/dnssec: filter bitmap also for NXDOMAIN responses
We change nxdomain to nodata, so at the point when we receive the
reply it can be nxdomain or nodata. In both cases we should filter the
nsec bitmap.
Change the code and add explicit tests for this.
* More tests