In [1] we removed the related jobs for these EOL releases. Here we deal with removing code related to these branches including any conditionals or special cases from emit releases and the build-containers and run-test roles. Also removes some really old references to newton. [1] https://review.opendev.org/c/openstack/tripleo-ci/+/838110 Change-Id: I184cd525a8696b0b634ac8d6f895ab642ac5aa33