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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 master in 10 minutes and 18 seconds (queued for 47 seconds)
Status Job ID Name Coverage
  Test
passed #4627
android

00:04:21

passed #4630
debian-testing

00:03:43

passed #4628
go-1.13

00:01:07

passed #4629
go-1.14

00:01:05