Currently, upstream CI test documentation against different Ansible
versions, but playbook tests are only executed with Ansible 2.9 series.
This patch add support for running playbook tests against Ansible 2.9,
ansible-core 2.11, and against latest version of Ansible.
As running all the tests for every PR would take too long, the tests
for every PR use only Anisble 2.9, and are executed on Fedora-latest
and CentOS 7 and 8.
A new pipeline for nightly tests was added, which runs the tests in the
same distros, using Ansible 2.9, latest and Ansible-core 2.11.
In the near future, Github will use Ubuntu 20.04, for workflows, and
this change will keep the upstream CI environment consistent between
Github and Azure.
Added comment about problem with no_log in Azure CI. While running on CI
using ansible 2.10a the content of attributes with no_log=True is
replaced by ***** on ansible causing test failures.
* Moved azure CI definitions from azure-pipelines.yml to
tests/azure/azure-pipelines.yml.
* Updated azure CI definitions to run playbook tests using docker
containers.
