Ignore Mem preflight errors on ubuntu upgrade testcase (#11859)

Author: VannTen

tests/files/packet_ubuntu22-calico-all-in-one-upgrade.yml

@@ -6,6 +6,8 @@ vm_memory: 1600
 
 # Kubespray settings
 auto_renew_certificates: true
+kubeadm_ignore_preflight_errors:
+  - Mem
 
 # Currently ipvs not available on KVM: https://packages.ubuntu.com/search?suite=focal&arch=amd64&mode=exactfilename&searchon=contents&keywords=ip_vs_sh.ko
 kube_proxy_mode: iptables