Resolve issues such as coredns component anomalies caused by DNS coverage.
--Upgrade kube-dashboard to v2.7.
--Upgrade ETCD to v3.5.13.
--Resolve the issue of coredns component anomalies caused by local dns coverage in Ubuntu system. #47
--Fix initialization failure in some scenarios.
--Fixed somw bugs.
Documentation: https://github.com/cloudnativer/kube-install/blob/master/README0.9.md