Wait more than 1 second for NSEC3 chain changes

One second may not be enough for an NSEC3 chain change triggered by an
UPDATE message to complete.  Wait up to 10 seconds when checking whether
a given NSEC3 chain change is complete in the "nsupdate" system test.

(cherry picked from commit f8746cdd)
42 jobs for !1849 with michal/minor-nsupdate-system-test-tweaks-v9_11 in 13 minutes and 12 seconds (queued for 5 seconds)
detached
Status Job ID Name Coverage
  Precheck
passed #219060
linux amd64
🐞:sid:amd64

00:01:34

passed #219059
linux amd64
misc:sid:amd64

00:00:29

 
  Build
passed #219071
linux amd64
asan:sid:amd64

00:02:02

passed #219072
linux amd64
clang:stretch:amd64

00:02:16

passed #219073
linux i386
clang:stretch:i386

00:01:56

passed #219061
linux amd64
docs:sid:amd64

00:00:44

passed #219070
linux amd64
gcc:bionic:amd64

00:01:29

passed #219062
linux amd64
gcc:centos6:amd64

00:02:13

passed #219063
linux amd64
gcc:centos7:amd64

00:02:40

passed #219068
linux amd64
gcc:fedora29:amd64

00:02:31

passed #219064
linux amd64
gcc:jessie:amd64

00:01:21

passed #219066
linux amd64
gcc:sid:amd64

00:02:01

passed #219067
linux i386
gcc:sid:i386

00:03:05

passed #219065
linux amd64
gcc:stretch:amd64

00:01:33

passed #219069
linux amd64
gcc:xenial:amd64

00:01:56

passed #219075
linux amd64
noassert:sid:amd64

00:01:11

passed #219074
linux amd64
pkcs11:sid:amd64

00:01:27

 
  Test
passed #219094
linux amd64
system:asan:sid:amd64

00:08:22

passed #219092
linux amd64
system:gcc:bionic:amd64

00:06:38

passed #219076
linux amd64
system:gcc:centos6:amd64

00:06:25

passed #219078
linux amd64
system:gcc:centos7:amd64

00:06:43

passed #219088
linux amd64
system:gcc:fedora29:amd64

00:07:03

passed #219080
linux amd64
system:gcc:jessie:amd64

00:07:05

passed #219084
linux amd64
system:gcc:sid:amd64

00:06:37

passed #219086
linux i386
system:gcc:sid:i386

00:07:02

passed #219082
linux amd64
system:gcc:stretch:amd64

00:06:38

passed #219090
linux amd64
system:gcc:xenial:amd64

00:06:40

passed #219099
linux amd64
system:noassert:sid:amd64

00:06:49

passed #219097
linux amd64
system:pkcs11:sid:amd64

00:06:22

passed #219095
linux amd64
unit:asan:sid:amd64

00:02:07

passed #219096
linux amd64
unit:clang:stretch:amd64

00:00:54

passed #219093
linux amd64
unit:gcc:bionic:amd64

00:01:13

passed #219077
linux amd64
unit:gcc:centos6:amd64

00:01:06

passed #219079
linux amd64
unit:gcc:centos7:amd64

00:01:16

passed #219089
linux amd64
unit:gcc:fedora29:amd64

00:01:14

passed #219081
linux amd64
unit:gcc:jessie:amd64

00:00:33

passed #219085
linux amd64
unit:gcc:sid:amd64

00:01:02

passed #219087
linux i386
unit:gcc:sid:i386

00:00:58

passed #219083
linux amd64
unit:gcc:stretch:amd64

00:01:04

passed #219091
linux amd64
unit:gcc:xenial:amd64

00:01:05

passed #219100
linux amd64
unit:noassert:sid:amd64

00:00:57

passed #219098
linux amd64
unit:pkcs11:sid:amd64

00:01:13