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由 Nanik T 提交于
This PR fix the issue of checking kubernetes-version and upgrading it. The fix now will do the following * Not specifying the --kubernetes-version flag means just use the currently deployed version. * If an update is available inform the user that they may use --kubernetes-version=<version>. * When --kubernetes-version is specifically set, upgrade the cluster. Also add integration testing to test upgrading and downgrading
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