Update kubernetes client to v26.1.0
Updating armada to focal base image
Remove xenial and opensuse dockerfiles
Update tox python from py35 to py38
Add apparmor for docker build
Uplift HTK chart version 0.2.52
Bumping up some python dependencies to get in sync with shipyard
Added clear-firewall role for airskiff-deploy playbook
Change-Id: If06a3f60466702d05a21c24a7cb8041bed41507a