distro/tests: install dig before knot-resolver

Keep knot-resolver installation along with other kresd-related
actions as close as possible to detect possible rpm transaction issues.
35 jobs for <span class="ref-name">rpm-ldconfig</span> in 13 minutes and 30 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #224260
docker linux amd64
build:asan:linux:amd64

00:01:18

passed #224259
docker linux amd64
build:linux:amd64

00:01:17

passed #224261
docker linux amd64 allowed to fail
srpm

00:00:46

 
  Test
passed #224294
docker linux amd64
deckard:linux:amd64

00:01:13

passed #224278
privileged
distro:epel-7

00:02:24

passed #224277
privileged
distro:fedora-29

00:02:56

passed #224269
docker
doc

00:01:01

passed #224267
dind
docker:build

00:02:35

passed #224268
docker linux amd64
installcheck:linux:amd64

00:01:20

passed #224295
docker linux amd64
installcheck:valgrind:linux:amd64

00:02:10

passed #224264
docker
lint:c

00:02:28

passed #224265
docker
lint:clang-scan-build

00:01:20

passed #224263
docker
lint:lua

00:00:50

passed #224262
docker linux amd64
lint:pedantic

00:01:49

passed #224272
docker
osx:build

00:07:06

passed #224274
docker linux amd64
pytests:lint

00:00:59

passed #224275
docker linux amd64
pytests:run

00:02:16

passed #224276
docker linux amd64
respdiff:iter:udp:linux:amd64

00:04:39

passed #224266
docker linux amd64
test:linux:amd64

00:01:17

passed #224273
docker linux amd64
test:linux:amd64:valgrind

00:01:45

failed #224270
docker linux amd64
deckard:linux:amd64

00:01:28

failed #224292
docker linux amd64
deckard:linux:amd64

00:01:25

failed #224293
docker linux amd64
installcheck:valgrind:linux:amd64

00:02:07

failed #224271
docker linux amd64
installcheck:valgrind:linux:amd64

00:02:10

 
  Extended
passed #224279
docker linux amd64
pytests:extended

00:02:47

passed #224280
respdiff
respdiff:fwd-tls6-kresd.udp6

00:00:16

passed #224281
respdiff
respdiff:fwd-udp6-kresd.udp6

00:00:16

passed #224285
respdiff
respdiff:fwd-udp6-unbound.tcp6

00:00:16

passed #224286
respdiff
respdiff:fwd-udp6-unbound.tls6

00:00:16

passed #224284
respdiff
respdiff:fwd-udp6-unbound.udp6

00:00:16

passed #224283
respdiff
respdiff:iter.tls6

00:00:17

passed #224282
respdiff
respdiff:iter.udp6

00:00:16

passed #224287
respdiff
resperf:fwd-tls6.udp-asan

00:00:16

passed #224288
respdiff
resperf:fwd-udp6.udp-asan

00:00:16

passed #224289
respdiff
resperf:iter.udp-asan

00:00:16