pytest/test_tcp_pipelining: longer delay for first query

In our CI, this test ocassionally fails. This is most likely due to
delays in kernel processing due to many virtualization layers coupled
with massive paralelization of tests.

Closes #427
31 jobs for ci-stabilize-pytests in 9 minutes and 32 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #217345
amd64 linux docker
build:asan:linux:amd64

00:01:14

passed #217344
amd64 linux docker
build:linux:amd64

00:01:14

passed #217346
amd64 linux docker allowed to fail
srpm

00:00:44

 
  Test
passed #217355
amd64 linux docker
deckard:linux:amd64

00:01:45

passed #217363
privileged
distro:epel-7

00:01:58

passed #217362
privileged
distro:fedora-29

00:02:28

passed #217354
docker
doc

00:00:50

passed #217352
dind
docker:build

00:01:52

passed #217353
amd64 linux docker
installcheck:linux:amd64

00:00:56

passed #217356
amd64 linux docker
installcheck:valgrind:linux:amd64

00:01:44

passed #217349
docker
lint:c

00:02:11

passed #217350
docker
lint:clang-scan-build

00:01:00

passed #217348
docker
lint:lua

00:00:39

passed #217347
amd64 linux docker
lint:pedantic

00:01:18

passed #217357
docker
osx:build

00:02:41

passed #217359
amd64 linux docker
pytests:lint

00:00:28

passed #217360
amd64 linux docker
pytests:run

00:02:18

passed #217361
amd64 linux docker
respdiff:iter:udp:linux:amd64

00:04:45

passed #217351
amd64 linux docker
test:linux:amd64

00:00:58

passed #217358
amd64 linux docker
test:linux:amd64:valgrind

00:01:09

 
  Extended
passed #217364
amd64 linux docker
pytests:extended

00:03:28

passed #217365
respdiff
respdiff:fwd-tls6-kresd.udp6

00:00:17

passed #217366
respdiff
respdiff:fwd-udp6-kresd.udp6

00:00:19

passed #217370
respdiff
respdiff:fwd-udp6-unbound.tcp6

00:00:20

passed #217371
respdiff
respdiff:fwd-udp6-unbound.tls6

00:00:19

passed #217369
respdiff
respdiff:fwd-udp6-unbound.udp6

00:00:19

passed #217368
respdiff
respdiff:iter.tls6

00:00:19

passed #217367
respdiff
respdiff:iter.udp6

00:00:19

passed #217372
respdiff
resperf:fwd-tls6.udp-asan

00:00:19

passed #217373
respdiff
resperf:fwd-udp6.udp-asan

00:00:19

passed #217374
respdiff
resperf:iter.udp-asan

00:00:19