fix broken masterformat test

- dig command had the @ parameter in the wrong place
- private-dnskey and private-cdnskey are queried in a separate
  loop, which strips 'private-' from the name to determine the qtype
42 jobs for !1365 with 823-masterformat-test-fix in 21 minutes and 28 seconds (queued for 5 seconds)
detached
Status Job ID Name Coverage
  Precheck
passed #153498
amd64 linux
🐞:sid:amd64

00:00:43

passed #153497
amd64 linux
misc:sid:amd64

00:00:18

 
  Build
passed #153508
amd64 linux
asan:sid:amd64

00:03:31

passed #153509
amd64 linux
clang:stretch:amd64

00:01:55

passed #153510
i386 linux
clang:stretch:i386

00:01:54

passed #153499
amd64 linux
docs:sid:amd64

00:01:00

passed #153507
amd64 linux
gcc:bionic:amd64

00:01:50

passed #153500
amd64 linux
gcc:centos6:amd64

00:01:41

passed #153501
amd64 linux
gcc:centos7:amd64

00:02:21

passed #153502
amd64 linux
gcc:jessie:amd64

00:01:14

passed #153504
amd64 linux
gcc:sid:amd64

00:01:34

passed #153505
i386 linux
gcc:sid:i386

00:01:38

passed #153503
amd64 linux
gcc:stretch:amd64

00:01:53

passed #153506
amd64 linux
gcc:xenial:amd64

00:01:49

passed #153512
amd64 linux
noassert:sid:amd64

00:01:08

passed #153511
amd64 linux
pkcs11:sid:amd64

00:01:30

 
  Test
passed #153521
amd64 linux
install:gcc:sid:amd64

00:02:12

passed #153582
linux amd64
system:asan:sid:amd64

00:07:58

passed #153528
amd64 linux
system:gcc:bionic:amd64

00:06:32

passed #153513
amd64 linux
system:gcc:centos6:amd64

00:06:24

passed #153515
amd64 linux
system:gcc:centos7:amd64

00:06:03

passed #153517
amd64 linux
system:gcc:jessie:amd64

00:07:54

passed #153522
amd64 linux
system:gcc:sid:amd64

00:06:27

passed #153541
linux i386
system:gcc:sid:i386

00:06:31

passed #153519
amd64 linux
system:gcc:stretch:amd64

00:07:56

passed #153526
amd64 linux
system:gcc:xenial:amd64

00:06:06

passed #153535
amd64 linux
system:noassert:sid:amd64

00:08:06

passed #153533
amd64 linux
system:pkcs11:sid:amd64

00:08:02

passed #153531
amd64 linux
unit:asan:sid:amd64

00:01:07

passed #153532
amd64 linux
unit:clang:stretch:amd64

00:00:50

passed #153529
amd64 linux
unit:gcc:bionic:amd64

00:00:51

passed #153514
amd64 linux
unit:gcc:centos6:amd64

00:00:45

passed #153516
amd64 linux
unit:gcc:centos7:amd64

00:00:49

passed #153518
amd64 linux
unit:gcc:jessie:amd64

00:00:30

passed #153523
amd64 linux
unit:gcc:sid:amd64

00:00:50

passed #153525
i386 linux
unit:gcc:sid:i386

00:00:42

passed #153520
amd64 linux
unit:gcc:stretch:amd64

00:00:45

passed #153527
amd64 linux
unit:gcc:xenial:amd64

00:00:56

passed #153536
amd64 linux
unit:noassert:sid:amd64

00:00:43

passed #153534
amd64 linux
unit:pkcs11:sid:amd64

00:00:52

failed #153530
amd64 linux
system:asan:sid:amd64

00:10:13

failed #153524
i386 linux
system:gcc:sid:i386

00:09:08