Cleanup fctx->finds before sending 'final' query after qname minimization.

At the beginning of qname minimization we get fctx->finds filled with what's
in the cache at this point, in worst case root servers. After doing full
run querying for NSes at different levels we need to clean it and refill
it with proper values from cache.
27 jobs for 16-cleanup-finds-before-sending-final-query in 8 minutes and 51 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Precheck
passed #83378
amd64 docker linux
precheck:debian:sid:amd64

00:00:17

 
  Build
passed #83379
amd64 docker linux
build:centos:centos6:amd64

00:02:35

passed #83380
amd64 docker linux
build:centos:centos7:amd64

00:02:42

passed #83381
amd64 docker linux
build:clang:debian:stretch:amd64

00:01:56

passed #83385
i386 docker linux
build:clang:debian:stretch:i386

00:01:32

passed #83382
amd64 docker linux
build:debian:jessie:amd64

00:01:50

passed #83384
amd64 docker linux
build:debian:sid:amd64

00:02:04

passed #83386
i386 docker linux
build:debian:sid:i386

00:01:30

passed #83383
amd64 docker linux
build:debian:stretch:amd64

00:01:27

passed #83387
amd64 docker linux
pkcs11:build:debian:sid:amd64

00:01:30

 
  Test
passed #83388
amd64 docker linux
docs:debian:sid:amd64

00:01:00

passed #83402
amd64 docker linux
install:debian:sid:amd64

00:01:54

passed #83404
amd64 docker linux
pkcs11:systemtest:debian:sid:amd64

00:04:59

passed #83403
amd64 docker linux
pkcs11:unittest:debian:sid:amd64

00:00:59

passed #83396
amd64 docker linux
systemtest:centos:centos6:amd64

00:05:24

passed #83397
amd64 docker linux
systemtest:centos:centos7:amd64

00:05:01

passed #83398
amd64 docker linux
systemtest:debian:jessie:amd64

00:05:21

passed #83400
amd64 docker linux
systemtest:debian:sid:amd64

00:05:03

passed #83401
i386 docker linux
systemtest:debian:sid:i386

00:05:38

passed #83399
amd64 docker linux
systemtest:debian:stretch:amd64

00:05:29

passed #83389
amd64 docker linux
unittest:centos:centos6:amd64

00:01:03

passed #83390
amd64 docker linux
unittest:centos:centos7:amd64

00:00:56

passed #83394
amd64 docker linux
unittest:clang:debian:stretch:amd64

00:00:50

passed #83391
amd64 docker linux
unittest:debian:jessie:amd64

00:00:57

passed #83393
amd64 docker linux
unittest:debian:sid:amd64

00:00:57

passed #83395
i386 docker linux
unittest:debian:sid:i386

00:00:49

passed #83392
amd64 docker linux
unittest:debian:stretch:amd64

00:00:55