Verify the set of machines that have docker installed and update labels

[smlambert]

We currently have 5 machines labelled with docker for use by test: https://ci.adoptopenjdk.net/label/ci.role.test&&hw.arch.x86&&sw.os.linux&&sw.tool.docker/

Given that docker is in the ansible playbooks, I think there are actually more machines with docker installed than are labelled with sw.tool.docker. We should go through the set of machines and try to run the external (docker-based tests from the openjdk-tests repo) to verify which additional test machines can be used for external tests.

[sxa]

Bear in mind several godaddy ones currently have it installed but it doesn't quite work as per #721

[sophia-guo]

Yes, still have the error with godaddy ones 'The command '/bin/sh -c apt-get update && apt-get -y install ant apt-transport-https ca-certificates curl git make unzip vim' returned a non-zero code: 100'

https://ci.adoptopenjdk.net/view/work%20in%20progress/job/Grinder_Sandbox/1047/console

[smlambert]

Been through the set of https://ci.adoptopenjdk.net/label/hw.arch.ppc64le/ test machines, 5/11 have docker installed (ubuntu based ones), label is present.

Going through s390x now, looks like docker present on test-marist-ubuntu1604-s390x-4 so label added, will confirm others and add labels to remaining machines shortly.

[Willsparker]

I thought I'd help the effort. I used Ansible to just query all non-windows test machines with docker --version. (For ease, I used the superuser that is meant to be setup on all machines).
The following are the test machines that have docker installed in some capacity.

AWS: 
   ubuntu1804-armv8-1

GoDaddy:
  centos7-x64-1
  centos7-x64-2
  centos7-x64-3
  centos7-x64-4
  debian8-x64-1
  debian8-x64-2
  debian8-x64-3
  debian8-x64-4
  ubuntu1604-x64-1
  ubuntu1604-x64-2
  ubuntu1604-x64-3
  ubuntu1604-x64-4

Osuosl:
  ubuntu1604-ppc64le-1
  ubuntu1604-ppc64le-2
  ubuntu1604-ppc64le-3
  ubuntu1604-ppc64le-4
  ubuntu1804-ppc64le-1
  ubuntu1804-ppc64le-2

Packet:
  ubuntu1604-x64-1
  ubuntu1604-x64-2
  ubuntu1604-x64-3

Marist:
  sles12-s390x-1
  ubuntu1604-s390x-1
  ubuntu1604-s390x-2
  ubuntu1604-s390x-3
  ubuntu1604-s390x-4

Scaleway:
  ubuntu1604-x64-1

Softlayer:
  rhel74-x64-1
  ubuntu1604-x64-1

[sxa]

Bumping this for two reasons:

1. A number of the machines listed above, such as the GoDaddy and Scaleway systems, are no longer around, and many of the ubuntu1604 machines are no longer Ubuntu 16.04
2. Given that we have good capacity on Linux/aarch64, we should ensure we can run these tests on that platform as well.