Merge pull request #58442 from m1093782566/ipvs-ga

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Declare IPVS-based kube-proxy GA and remove feature gateway

**What this PR does / why we need it**:

As discussed in sig-network meeting, we decided to target IPVS-based kube-proxy GA in 1.10.

This PR declares IPVS-based kube-proxy GA and remove feature gateway.

**Which issue(s) this PR fixes**:

Fixes: #58443

issue in feature repo: https://github.com/kubernetes/features/issues/265

**Special notes for your reviewer**:

**Release note**:

```release-note
Declare IPVS-based kube-proxy GA
```

@quinton-hoole

hack/local-up-cluster.sh

@@ -126,13 +126,11 @@ if [ "${CLOUD_PROVIDER}" == "openstack" ]; then
     fi
 fi
 
-# set feature gates if using ipvs mode
+# load required kernel modules if proxy mode is set to "ipvs".
 if [ "${KUBE_PROXY_MODE}" == "ipvs" ]; then
     # If required kernel modules are not available, fall back to iptables.
     sudo modprobe -a ip_vs ip_vs_rr ip_vs_wrr ip_vs_sh nf_conntrack_ipv4
-    if [[ $? -eq 0 ]]; then
-      FEATURE_GATES="${FEATURE_GATES},SupportIPVSProxyMode=true"
-    else
+    if [[ $? -ne 0 ]]; then
       echo "Required kernel modules for ipvs not found. Falling back to iptables mode."
       KUBE_PROXY_MODE=iptables
     fi