Move centos7-crio CI job to centos8 (#7327)

tests/files/packet_centos8-calico.yml

@@ -12,5 +12,5 @@ dashboard_namespace: "kube-dashboard"
 dashboard_enabled: true
 loadbalancer_apiserver_type: haproxy
 
-# required / not autodetected for now
-calico_iptables_backend: "NFT"
+# required
+calico_iptables_backend: "Auto"

tests/files/packet_centos8-crio.yml

@@ -1,6 +1,6 @@
 ---
 # Instance settings
-cloud_image: centos-7
+cloud_image: centos-8
 mode: default
 
 # Kubespray settings
@@ -8,8 +8,8 @@ deploy_netchecker: true
 dns_min_replicas: 1
 container_manager: crio
 
-download_localhost: false
-download_run_once: true
-
 # CRI-O requirements
 etcd_deployment_type: host
+
+# required
+calico_iptables_backend: "Auto"