RPZ now treats covering NSEC records the same as negative answers

When `synth-from-dnssec` is on, there are lots of "stop on unrecognized
qresult in rpz_rewrite" failures logged at DEBUG(1) which did not
previously occur.
25 jobs for u/fanf2/rpz-cleanup in 9 minutes and 58 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Precheck
passed #31185
amd64 docker linux
precheck:debian:sid:amd64

00:00:13

 
  Build
passed #31186
amd64 docker linux
build:centos:centos6:amd64

00:02:47

passed #31187
amd64 docker linux
build:centos:centos7:amd64

00:02:45

passed #31188
amd64 docker linux
build:clang:debian:sid:amd64

00:03:19

passed #31192
i386 docker linux
build:clang:debian:sid:i386

00:03:38

passed #31189
amd64 docker linux
build:debian:jessie:amd64

00:03:09

passed #31191
amd64 docker linux
build:debian:sid:amd64

00:03:15

passed #31193
i386 docker linux
build:debian:sid:i386

00:03:31

passed #31190
amd64 docker linux
build:debian:stretch:amd64

00:03:15

passed #31194
amd64 docker linux
pkcs11:build:debian:sid:amd64

00:03:34

 
  Test
passed #31209
amd64 docker linux
pkcs11:systemtest:debian:sid:amd64

00:06:03

passed #31208
amd64 docker linux
pkcs11:unittest:debian:sid:amd64

00:01:59

passed #31202
amd64 docker linux
systemtest:centos:centos6:amd64

00:04:39

passed #31203
amd64 docker linux
systemtest:centos:centos7:amd64

00:04:41

passed #31204
amd64 docker linux
systemtest:debian:jessie:amd64

00:05:59

passed #31206
amd64 docker linux
systemtest:debian:sid:amd64

00:06:02

passed #31207
i386 docker linux
systemtest:debian:sid:i386

00:06:04

passed #31205
amd64 docker linux
systemtest:debian:stretch:amd64

00:06:03

passed #31195
amd64 docker linux
unittest:centos:centos6:amd64

00:00:53

passed #31196
amd64 docker linux
unittest:centos:centos7:amd64

00:00:49

passed #31200
amd64 docker linux
unittest:clang:debian:sid:amd64

00:00:49

passed #31197
amd64 docker linux
unittest:debian:jessie:amd64

00:00:57

passed #31199
amd64 docker linux
unittest:debian:sid:amd64

00:00:49

passed #31201
i386 docker linux
unittest:debian:sid:i386

00:00:46

passed #31198
amd64 docker linux
unittest:debian:stretch:amd64

00:00:46