function build_source_flannel {
curl -sL https://raw.githubusercontent.com/coreos/flannel/${FLANNEL_VERSION}/Documentation/kube-flannel.yml -o ${SCRIPTDIR}/addons/flannel.yaml
cat <<EOF >${SCRIPTDIR}/templates/flannel-addon.yaml
function build_source_flannel {
curl -sL https://raw.githubusercontent.com/coreos/flannel/${FLANNEL_VERSION}/Documentation/kube-flannel.yml -o ${SCRIPTDIR}/addons/flannel.yaml
cat <<EOF >${SCRIPTDIR}/templates/flannel-addon.yaml