Merge branch 'retry-when-under-load' into 'master'

retry tests which failed due to load

See merge request !134
10 jobs from master in 2 minutes and 3 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #210283
docker linux amd64
test:augeas

00:00:28

passed #210289
docker linux amd64
test:comparative:kresd

00:02:02

passed #210284
docker linux amd64
test:flake8

00:00:21

passed #210290
docker linux amd64
test:latest:kresd

00:01:00

passed #210285
docker linux amd64
test:mypy

00:00:26

passed #210286
docker linux amd64
test:pylint

00:00:24

passed #210287
docker linux amd64
test:rplint

00:00:18

passed #210292
docker linux amd64
test:sanity:pdnsrecursor

00:00:31

passed #210291
docker linux amd64
test:sanity:unbound

00:00:30

passed #210288
docker linux amd64
test:unittests

00:00:20