* Update targets for CI for devel branch; move some targets to stable-2.10.
* Skipping test on RHEL 8.3 (it is already skipped on RHEL 8.2).
* Linting.
* Shut 2.9/2.10 pylint complaints up.
* Add Ubuntu 20.04 to CI.
* Skip mqtt test on Ubuntu 20.04.
* Use explicit disable instead of aliases.
* Add Ubuntu 20.04 specific config for setup_postgresql_db.
* Fix postgres version.
* Fix 2.9/2.10 cloud
* Fix splunk callback tests.
* ansible_virtualization_type on AZP can be one of container/containerd instead of docker for dockerized tests.
* Disable nomad tests.
* Work around AZP bugs.