iterate: allow lame negative answers in PERMISSIVE mode

Some nameservers are hopelessly broken (ns1-ord.salesforce.com),
and will return lame negative answers which will flag the nameserver
as bad, so it wouldn't be picked for valid queries.
18 jobs for marek/fixes-for-workarounds in 9 minutes and 6 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #132760
docker linux amd64
build:clang:linux:amd64

00:00:40

passed #132759
docker linux amd64
build:linux:amd64

00:00:39

passed #132761
docker linux amd64
srpm

00:00:26

 
  Test
passed #132768
docker linux amd64
deckard:linux:amd64

00:07:52

passed #132775
privileged
distro:epel-7

00:03:29

passed #132774
privileged
distro:fedora-27

00:04:18

passed #132767
docker
doc

00:00:58

passed #132766
docker linux amd64
installcheck:linux:amd64

00:01:14

passed #132769
docker linux amd64
installcheck:valgrind:linux:amd64

00:01:14

passed #132763
docker
lint:c

00:02:45

failed #132764
docker allowed to fail
lint:clang-scan-build

00:01:21

passed #132762
docker
lint:lua

00:00:37

passed #132772
docker linux amd64
respdiff:iter:tcp:linux:amd64

00:02:33

passed #132773
docker linux amd64
respdiff:iter:tls:linux:amd64

00:02:36

passed #132771
docker linux amd64
respdiff:iter:udp:linux:amd64

00:02:25

passed #132765
docker linux amd64
test:linux:amd64

00:01:46

passed #132770
docker linux amd64
test:linux:amd64:valgrind

00:00:50

 
  Coverage
passed #132776
docker linux amd64
coverage

00:00:28

69.1%
 
Name Stage Failure
failed
lint:clang-scan-build Test
  CCLD	modules/cookies/cookies.so
CCLD modules/hints/hints.so
CCLD modules/stats/stats.so
scan-build: 28 bugs found.
scan-build: Run 'scan-view /builds/knot/knot-resolver/scan-results/2018-04-23-155309-13-1' to examine bug reports.
Uploading artifacts...
scan-results: found 33 matching files
Uploading artifacts to coordinator... ok
id=132764 responseStatus=201 Created token=tbNfz9gS
ERROR: Job failed: exit code 1