Fix IP regex used in the "resolver" system test

If dots are not escaped in the "1.2.3.4" regular expressions used for
checking whether IP address 1.2.3.4 is present in the tested resolver's
answers, a COOKIE that matches such a regular expression will trigger a
false positive for the "resolver" system test.  Properly escape dots in
the aforementioned regular expressions to prevent that from happening.
40 jobs for !1568 with michal/fix-ip-regex-used-in-the-resolver-system-test in 17 minutes and 14 seconds (queued for 4 seconds)
detached
Status Job ID Name Coverage
  Precheck
passed #185521
amd64 linux
🐞:sid:amd64

00:00:40

passed #185520
amd64 linux
misc:sid:amd64

00:00:17

 
  Build
passed #185532
amd64 linux
asan:sid:amd64

00:02:04

passed #185533
amd64 linux
clang:stretch:amd64

00:01:07

passed #185534
i386 linux
clang:stretch:i386

00:01:58

passed #185522
amd64 linux
docs:sid:amd64

00:00:42

passed #185531
amd64 linux
gcc:bionic:amd64

00:01:06

passed #185523
amd64 linux
gcc:centos6:amd64

00:01:46

passed #185524
amd64 linux
gcc:centos7:amd64

00:02:29

passed #185529
amd64 linux
gcc:fedora29:amd64

00:02:00

passed #185525
amd64 linux
gcc:jessie:amd64

00:01:44

passed #185527
amd64 linux
gcc:sid:amd64

00:02:00

passed #185528
i386 linux
gcc:sid:i386

00:01:58

passed #185526
amd64 linux
gcc:stretch:amd64

00:01:06

passed #185530
amd64 linux
gcc:xenial:amd64

00:01:49

passed #185535
amd64 linux
pkcs11:sid:amd64

00:01:09

 
  Test
passed #185554
amd64 linux
system:asan:sid:amd64

00:08:16

passed #185552
amd64 linux
system:gcc:bionic:amd64

00:07:10

passed #185536
amd64 linux
system:gcc:centos6:amd64

00:06:57

passed #185538
amd64 linux
system:gcc:centos7:amd64

00:06:43

passed #185548
amd64 linux
system:gcc:fedora29:amd64

00:06:52

passed #185540
amd64 linux
system:gcc:jessie:amd64

00:06:32

passed #185544
amd64 linux
system:gcc:sid:amd64

00:06:42

passed #185546
i386 linux
system:gcc:sid:i386

00:07:08

passed #185598
linux amd64
system:gcc:stretch:amd64

00:06:23

passed #185550
amd64 linux
system:gcc:xenial:amd64

00:06:53

passed #185557
amd64 linux
system:pkcs11:sid:amd64

00:06:59

passed #185555
amd64 linux
unit:asan:sid:amd64

00:01:07

passed #185556
amd64 linux
unit:clang:stretch:amd64

00:00:49

passed #185553
amd64 linux
unit:gcc:bionic:amd64

00:00:46

passed #185537
amd64 linux
unit:gcc:centos6:amd64

00:00:49

passed #185539
amd64 linux
unit:gcc:centos7:amd64

00:00:58

passed #185549
amd64 linux
unit:gcc:fedora29:amd64

00:01:01

passed #185541
amd64 linux
unit:gcc:jessie:amd64

00:00:31

passed #185545
amd64 linux
unit:gcc:sid:amd64

00:00:54

passed #185547
i386 linux
unit:gcc:sid:i386

00:00:50

passed #185543
amd64 linux
unit:gcc:stretch:amd64

00:00:55

passed #185551
amd64 linux
unit:gcc:xenial:amd64

00:00:56

passed #185558
amd64 linux
unit:pkcs11:sid:amd64

00:00:51

failed #185542
amd64 linux
system:gcc:stretch:amd64

00:07:33