fixup: remove useless errexit setting

cluster/common.sh

@@ -1069,7 +1069,6 @@ function generate-certs {
   local -r cert_create_debug_output=$(mktemp "${KUBE_TEMP}/cert_create_debug_output.XXX")
   # Note: This was heavily cribbed from make-ca-cert.sh
   (set -x
-   set -o errexit
     cd "${CERT_DIR}"
     ./easyrsa init-pki
     # this puts the cert into pki/ca.crt and the key into pki/private/ca.key