Fix the clang 12 warnings with multi-line strings in string arrays

The clang 12 has a new warning that warns when using multi-line strings
in the string arrays, f.e.:

    { "aa",
      "b"
      "b",
      "cc" }

would generate warning like this:

    private_test.c:162:7: error: suspicious concatenation of string literals in an array initialization; did you mean to separate the elements with a comma? [-Werror,-Wstring-concatenation]
                                      "33333/RSASHA1" };
                                      ^
    private_test.c:161:7: note: place parentheses around the string literal to silence warning
                                      "Done removing signatures for key "
                                      ^
    private_test.c:197:7: error: suspicious concatenation of string literals in an array initialization; did you mean to separate the elements with a comma? [-Werror,-Wstring-concatenation]
                                      "NSEC chain",
                                      ^
    private_test.c:196:7: note: place parentheses around the string literal to silence warning
                                      "Removing NSEC3 chain 1 0 30 DEAF / creating "
                                      ^
    2 errors generated.
74 jobs for !4129 with ondrej/fix-split-string-warnings-gcc-10 in 17 minutes (queued for 8 seconds)
detached
Status Job ID Name Coverage
  Autoconf
passed #1158408
amd64 linux
autoreconf

00:00:16

 
  Precheck
passed #1158410
amd64 linux
clang-format

00:00:18

passed #1158411
amd64 linux
coccinelle

00:03:05

passed #1158412
amd64 linux
danger

00:00:12

passed #1158409
amd64 linux
misc

00:00:17

passed #1158413
amd64 linux
tarball-create

00:01:42

 
  Build
passed #1158426
amd64 linux
clang:asan

00:02:04

passed #1158430
amd64 linux
clang:buster:amd64

00:01:02

passed #1158433
amd64 libvirt
clang:freebsd11:amd64

00:01:14

passed #1158434
amd64 libvirt
clang:freebsd12:amd64

00:01:10

passed #1158435
amd64 libvirt
clang:openbsd:amd64

00:02:24

passed #1158428
amd64 linux
clang:tsan

00:01:17

passed #1158414
amd64 linux
gcc:alpine3.12:amd64

00:00:55

passed #1158425
amd64 linux
gcc:asan

00:01:41

passed #1158418
amd64 linux
gcc:buster:amd64

00:00:59

passed #1158415
amd64 linux
gcc:centos7:amd64

00:00:45

passed #1158416
amd64 linux
gcc:centos8:amd64

00:00:44

passed #1158424
amd64 linux
gcc:focal:amd64

00:01:00

passed #1158429
amd64 linux
gcc:mutexatomics

00:00:58

passed #1158420
amd64 linux
gcc:out-of-tree

00:01:00

passed #1158419
amd64 linux
gcc:sid:amd64

00:01:14

passed #1158421
i386 linux
gcc:sid:i386

00:00:59

passed #1158431
amd64 linux
gcc:softhsm2.4

00:00:58

passed #1158432
amd64 linux
gcc:softhsm2.6

00:00:54

passed #1158417
amd64 linux
gcc:stretch:amd64

00:01:07

passed #1158427
amd64 linux
gcc:tsan

00:01:13

passed #1158422
amd64 linux
gcc:tumbleweed:amd64

00:01:01

passed #1158423
amd64 linux
gcc:xenial:amd64

00:00:54

passed #1158436
amd64 windows
msvc:windows:amd64

00:00:43

 
  Unit
passed #1158448
amd64 linux
unit:clang:asan

00:01:17

passed #1158452
amd64 linux
unit:clang:buster:amd64

00:00:59

passed #1158455
amd64 libvirt
unit:clang:freebsd11:amd64

00:01:25

passed #1158456
amd64 libvirt
unit:clang:freebsd12:amd64

00:01:16

passed #1158450
amd64 linux
unit:clang:tsan

00:02:46

passed #1158437
amd64 linux
unit:gcc:alpine3.12:amd64

00:01:05

passed #1158447
amd64 linux
unit:gcc:asan

00:01:10

passed #1158441
amd64 linux
unit:gcc:buster:amd64

00:01:03

passed #1158438
amd64 linux
unit:gcc:centos7:amd64

00:00:59

passed #1158439
amd64 linux
unit:gcc:centos8:amd64

00:00:56

passed #1158446
amd64 linux
unit:gcc:focal:amd64

00:00:56

passed #1158451
amd64 linux
unit:gcc:mutexatomics

00:00:59

passed #1158442
amd64 linux
unit:gcc:sid:amd64

00:00:59

passed #1158443
i386 linux
unit:gcc:sid:i386

00:01:03

passed #1158453
amd64 linux
unit:gcc:softhsm2.4

00:01:04

passed #1158454
amd64 linux
unit:gcc:softhsm2.6

00:00:56

passed #1158440
amd64 linux
unit:gcc:stretch:amd64

00:01:03

passed #1158449
amd64 linux
unit:gcc:tsan

00:04:05

passed #1158444
amd64 linux
unit:gcc:tumbleweed:amd64

00:00:58

passed #1158445
amd64 linux
unit:gcc:xenial:amd64

00:00:59

 
  System
passed #1158468
amd64 linux
system:clang:asan

00:12:19

failed #1158472
amd64 linux
system:clang:buster:amd64

00:10:25

passed #1158475
amd64 libvirt
system:clang:freebsd11:amd64

00:10:22

passed #1158476
amd64 libvirt
system:clang:freebsd12:amd64

00:10:53

failed #1158470
amd64 linux allowed to fail
system:clang:tsan

00:14:36

passed #1158457
amd64 linux
system:gcc:alpine3.12:amd64

00:11:53

passed #1158467
amd64 linux
system:gcc:asan

00:12:27

passed #1158461
amd64 linux
system:gcc:buster:amd64

00:10:51

passed #1158458
amd64 linux
system:gcc:centos7:amd64

00:10:35

passed #1158459
amd64 linux
system:gcc:centos8:amd64

00:12:03

passed #1158466
amd64 linux
system:gcc:focal:amd64

00:11:04

passed #1158471
amd64 linux
system:gcc:mutexatomics

00:10:46

passed #1158462
amd64 linux
system:gcc:sid:amd64

00:10:02

passed #1158463
i386 linux
system:gcc:sid:i386

00:10:53

passed #1158473
amd64 linux
system:gcc:softhsm2.4

00:11:07

passed #1158474
amd64 linux
system:gcc:softhsm2.6

00:11:24

passed #1158460
amd64 linux
system:gcc:stretch:amd64

00:11:31

failed #1158469
amd64 linux allowed to fail
system:gcc:tsan

00:14:27

passed #1158464
amd64 linux
system:gcc:tumbleweed:amd64

00:10:59

passed #1158465
amd64 linux
system:gcc:xenial:amd64

00:10:09

 
  Docs
passed #1158477
amd64 linux
docs

00:00:39

 
  Postcheck
passed #1158481
amd64 linux
cppcheck

00:00:44

passed #1158478
amd64 linux
flake8

00:00:23

passed #1158479
amd64 linux
pylint

00:00:24

passed #1158480
amd64 linux
scan-build

00:04:06

 
Name Stage Failure
failed
system:clang:tsan System
No job log
failed
system:gcc:tsan System
No job log
failed
system:clang:buster:amd64 System
No job log