add support for testing recursive servers

4 jobs from 15-option-to-use-custom-port in 1 minute and 12 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #67676
docker linux
build:centos:centos7:amd64

00:34

passed #67677
docker linux
build:debian:sid:amd64

00:34

 
  Test
passed #67678
docker linux
test:centos:centos7:amd64

00:37

passed #67679
docker linux
test:debian:sid:amd64

00:37