Ansible update fixes

[GMW99]

Epel has now released version 5.4 of Ansible within stable with this there are a few things that broke these are the fixes.

• Selinux commands
  • Ansible no longer defaults to platform-python which is python3.6 which allows the python36-libselinux package to be used, instead it uses python3.8 and therefore the libselinux package cannot be used due to being a different version. The fix was to set the ansible python interpreter to platform-python as this defaults to python3.6 and is the recommended solution: https://bugzilla.redhat.com/show_bug.cgi?id=2091684
• grafana_datasource module
  • The fix was to change url to ds_url as due to this version update url no longer aliases to ds_url and now is an alias to grafana_url, therefore making the url explicit with ds_url fixed this problem. An overview of the new format can be found here: https://docs.ansible.com/ansible/5/collections/community/grafana/grafana_datasource_module.html.

[milliams]

I've been annoyed that we're stuck on Ansible 2.9 for so long so the fact that 5 is now available in EPEL is very welcome news. Given how much has changed in Ansible in the meantime, I'm surprised that this is all the changes that are needed. To give some more confidence, would you be able to also edit the CI config file (.github/workflows/main.yml) in your branch to change the version of Ansible specified from:

'ansible<2.10,>=2.9' 'ansible-lint<6.0.0'

to perhaps

'ansible>=5,<6' 'ansible-lint'

I expect there are things that will not be compatible.

Furthermore, the mgmt node bootstrap from Terraform (https://github.com/clusterinthecloud/terraform/blob/master/common-files/bootstrap.sh.tpl) runs Ansible before having installed EPEL so it will currently still be getting Ansible 2.9 (whereas the compute nodes to install EPEL before Ansible so will get the new version - https://github.com/clusterinthecloud/ansible/blob/6/roles/packer/templates/prepare_ansible.sh.j2). We might also need to install ansible-collection-community-general to get all the core community roles.