modules/bootkube/resources/bootkube.sh: Fix etcd TLS

The required TLS assets were not being copied to the location
expected by the control plane manifests, so external etcd was
not working if tectonic_etcd_tls_enabled was true.

modules/bootkube/resources/bootkube.sh

@@ -25,6 +25,11 @@ if [ -d /opt/tectonic/net-manifests ]; then
     rm -r /opt/tectonic/net-manifests
 fi
 
+mkdir -p /etc/kubernetes/bootstrap-secrets
+cp /opt/tectonic/tls/etcd-* /etc/kubernetes/bootstrap-secrets
+mkdir -p /etc/kubernetes/secrets
+cp /opt/tectonic/tls/etcd-* /etc/kubernetes/secrets
+
 # shellcheck disable=SC2154
 /usr/bin/docker run \
     --volume "$(pwd)":/assets \