Merge pull request #79846 from aramase/fix-golint-pkg/proxy

Fix golint failures in pkg/proxy

pkg/proxy/userspace/proxier.go

@@ -138,8 +138,8 @@ type Proxier struct {
 	stopChan chan struct{}
 }
 
-// assert Proxier is a ProxyProvider
-var _ proxy.ProxyProvider = &Proxier{}
+// assert Proxier is a proxy.Provider
+var _ proxy.Provider = &Proxier{}
 
 // A key for the portMap.  The ip has to be a string because slices can't be map
 // keys.