Extend distribution_check role to account for Ansible changes reg. facts

Somewhere between ansible [core 2.14.4] and ansible [core 2.15.0] the
logic for the distribution_version Ansible fact got changed. With the
newer Ansible version Debians distribution_version gets reported as 11.7
as opposed to getting reported as 11 with the old Ansible version. To
still allow for useful distribution checks, extend the
distribution_check role by allowing the specification of
distribution_major_versions and distribution_releases as well.
This way you can check for an Ubuntu version by using
distribution_version (which for example resolves to 18.04, while
distribution_major_version would resolve to 18 in that case) and check
for a Debian version by using distribution_major_version (which for
example resolves to 11, while distribution_version would resolve to 11.7
in that case).

playbooks/roles/send_only_mail_server/meta/main.yaml

@@ -3,5 +3,5 @@ dependencies: # noqa meta-no-info
     vars:
       distribution_check__supported_distributions:
         - name: Debian
-          versions:
+          major_versions:
             - "11"