Cleanup tests (#8234)

tests/files/packet_oracle7-canal-ha.yml

tests/files/packet_ubuntu16-canal-ha.yml

tests/files/packet_ubuntu16-canal-sep.yml

tests/files/packet_ubuntu16-docker-weave-sep.yml

tests/files/packet_ubuntu16-flannel-ha.yml

tests/files/packet_ubuntu16-kube-router-sep.yml

tests/files/packet_ubuntu16-kube-router-svc-proxy.yml

tests/files/packet_ubuntu18-calico-aio.yml

tests/files/packet_ubuntu18-calico-ha-recover-noquorum.yml

tests/files/packet_ubuntu18-calico-ha-recover.yml

tests/files/packet_ubuntu18-cilium-sep.yml

tests/files/packet_ubuntu18-crio.yml

tests/files/packet_ubuntu18-docker.yml

tests/files/packet_ubuntu18-flannel-ha-once.yml

tests/files/packet_ubuntu18-flannel-ha.yml

tests/files/packet_ubuntu18-ovn4nfv.yml

tests/files/packet_ubuntu20-calico-aio.yml

tests/files/packet_ubuntu20-calico-ha-wireguard.yml

tests/files/packet_ubuntu20-docker.yml

tests/files/tf-elastx_ubuntu18-calico.yml