hack/local-up-cluster.sh: Remove old dynamic certs

When running this script more than once on Debian and Ubuntu, we fail to
chown -R the CERT_DIR due to this file owned by root and the CERT_DIR
owned by the unprivileged user running the script.

Let's remove the file, that is something we can always do, before
generating the certs. This fixes the problem on Debian and Ubuntu local
setups.

Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>

hack/local-up-cluster.sh

@@ -502,6 +502,13 @@ function start_apiserver {
     fi
 
     if [[ "${REUSE_CERTS}" != true ]]; then
+      # Clean previous dynamic certs
+      # This file is owned by root, so we can't always overwrite it (depends if
+      # we run the script as root or not). Let's remove it, that is something we
+      # can always do: either we have write permissions as a user in CERT_DIR or
+      # we run the rm with sudo.
+      ${CONTROLPLANE_SUDO} rm -f "${CERT_DIR}"/kubelet-rotated.kubeconfig
+
       # Create Certs
       generate_certs
     fi