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Add Dockerfile and README for deploying probetest

The easiest way to set up the probe server behind a symmetric NAT is to
deploy it as a Docker container and alter the iptables rules for the
Docker network subnet that the container runs in.
4 jobs for issue/40013 in 18 minutes and 39 seconds (queued for 1 minute and 10 seconds)
Status Job ID Name Coverage
  Test
passed #3755
android

00:11:40

passed #3758
debian-testing

00:06:19

passed #3756
go-1.13

00:01:29

passed #3757
go-1.14

00:01:40