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Automatic merge from submit-queue (batch tested with PRs 49538, 49708, 47665, 49750, 49528) Lowercases hostname for kubeadm cert slice **What this PR does / why we need it**: Previously, unit tests on master were failing due to this error: ``` --- FAIL: TestSubCmdApiServerFlags (0.99s) certs_test.go:149: APIserverCert.DNSNames[0] is danehans-m-c1kp instead of DANEHANS-M-C1KP ``` The PR fixes the TestSubCmdApiServerFlags test, which uses the OS hostname to compare the apiserver serving cert and fails if the OS hostname is in caps. **Which issue this PR fixes**: fixes # https://github.com/kubernetes/kubeadm/issues/361 **Special notes for your reviewer**: **Release note**: ```NONE ```