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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 39 minutes and 30 seconds (queued for 1 minute)
latest
Status Job ID Name Coverage
  Test
passed #4623
android

00:19:43

passed #4626
debian-testing

00:15:15

passed #4624
go-1.13

00:03:26

passed #4625
go-1.14

00:01:05