Merge pull request #54957 from apelisse/update-kube-openapi

Automatic merge from submit-queue (batch tested with PRs 55004, 54957). 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>.

Update kube-openapi to use validation

**What this PR does / why we need it**: Moves openapi validation code to kube-openapi, so that we can move the rest of the code to apimachinery repository, so that later we can use it from both the client and the server.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #Nothing

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```

Kubernetes-commit: 55e216f56eac0082acc6be655d9ae09cf9ba38a8

vendor/k8s.io/apimachinery/pkg/util/net/http.go

@@ -276,17 +276,7 @@ func NewProxierWithNoProxyCIDR(delegate func(req *http.Request) (*url.URL, error
 	}
 
 	return func(req *http.Request) (*url.URL, error) {
-		host := req.URL.Host
-		// for some urls, the Host is already the host, not the host:port
-		if net.ParseIP(host) == nil {
-			var err error
-			host, _, err = net.SplitHostPort(req.URL.Host)
-			if err != nil {
-				return delegate(req)
-			}
-		}
-
-		ip := net.ParseIP(host)
+		ip := net.ParseIP(req.URL.Hostname())
 		if ip == nil {
 			return delegate(req)
 		}