Enables SCTPsupport in K8s v1.18 cluster

While we are still using Kubernetes v1.18, this change enables
SCTPSupport in the cluster via features gate.

Change-Id: I985ef66a72183dfacb1cb90841f572aff966ed72

devstack/plugin.sh

@@ -648,6 +648,7 @@ function run_k8s_api {
                 --tls-private-key-file=${KURYR_KUBERNETES_DATA_DIR}/server.key \
                 --token-auth-file=${KURYR_KUBERNETES_DATA_DIR}/known_tokens.csv \
                 --allow-privileged=true \
+                --feature-gates="SCTPSupport=true" \
                 --v=$(get_k8s_log_level) \
                 --logtostderr=true"
 
@@ -671,6 +672,7 @@ function run_k8s_controller_manager {
                 --min-resync-period=3m \
                 --v=$(get_k8s_log_level) \
                 --logtostderr=true \
+                --feature-gates="SCTPSupport=true" \
                 --leader-elect=false"
 
     run_process kubernetes-controller-manager "$command" root root
@@ -690,6 +692,7 @@ function run_k8s_scheduler {
                 --master=${KURYR_K8S_API_URL} \
                 --v=$(get_k8s_log_level) \
                 --logtostderr=true \
+                --feature-gates="SCTPSupport=true" \
                 --leader-elect=false"
 
     run_process kubernetes-scheduler "$command" root root
@@ -745,6 +748,7 @@ function run_k8s_kubelet {
         --address=0.0.0.0 \
         --enable-server \
         --network-plugin=cni \
+        --feature-gates="SCTPSupport=true" \
         --cni-bin-dir=$CNI_BIN_DIR \
         --cni-conf-dir=$CNI_CONF_DIR \
         --cert-dir=${KURYR_KUBERNETES_DATA_DIR}/kubelet.cert \