Support ubuntu-20

[v1v]

What

Enable Ubuntu 20 in test-kitchens

Expand to view some obsoleted details

✅ solved now

Issues

• Wait for Add Ubuntu 20.04 to CI and ansible-test ansible/ansible#69161
• Causes lowercase the instance-name test-kitchen/kitchen-docker#375

Issues with the test-kitchen

make converge PATTERN=oss-ubuntu-2004  
bundle exec kitchen converge oss-ubuntu-2004
+ bundle exec kitchen converge oss-ubuntu-2004
-----> Starting Kitchen (v2.2.5)
-----> Creating <oss-ubuntu-2004>...
       docker: invalid reference format: repository name must be lowercase.
       See 'docker run --help'.
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: 1 actions failed.
>>>>>>     Failed to complete #create action: [Expected process to exit with [0], but received '125'
---- Begin output of docker -H unix:///var/run/docker.sock run -d -p 22 -v /tmp/license.json -v /etc --name ossubuntu2004-vmartinez-myMaClocal-b90jxc1w --privileged PyYAML /sbin/init ----
STDOUT: 
STDERR: docker: invalid reference format: repository name must be lowercase.
See 'docker run --help'.
---- End output of docker -H unix:///var/run/docker.sock run -d -p 22 -v /tmp/license.json -v /etc --name ossubuntu2004-vmartinez-myMaClocal-b90jxc1w --privileged PyYAML /sbin/init ----
Ran docker -H unix:///var/run/docker.sock run -d -p 22 -v /tmp/license.json -v /etc --name ossubuntu2004-vmartinez-myMaClocal-b90jxc1w --privileged PyYAML /sbin/init returned 125] on oss-ubuntu-2004
>>>>>> ----------------------
>>>>>> Please see .kitchen/logs/kitchen.log for more details
>>>>>> Also try running `kitchen diagnose --all` for configuration

make: *** [converge] Error 20

I managed to bypass it locally by setting the hostname/computer-name to something else (lowercase)

[botelastic]

This PR has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
To track this PR (even if closed), please open a corresponding issue if one does not already exist.

[jmlrt]

👋 @v1v can you update this PR with the changes done in elastic/ansible-beats#118 🙏

[jmlrt]

LGTM⛴