Cleanup tests (#8234)

* Add Fedora 35 image, support and CI

* Cleanup tests and allow_failure for vagrant

tests/files/packet_ubuntu18-flannel-ha.yml

@@ -13,8 +13,6 @@ krew_enabled: true
 kubernetes_audit: true
 etcd_events_cluster_enabled: true
 local_volume_provisioner_enabled: true
-deploy_netchecker: true
-dns_min_replicas: 1
 kube_encrypt_secret_data: true
 ingress_nginx_enabled: true
 cert_manager_enabled: true