Bumping k8s dependencies to 1.13

vendor/google.golang.org/grpc/resolver/dns/go18_test.go

@@ -2,7 +2,7 @@
 
 /*
  *
- * Copyright 2017 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,29 +21,7 @@
 package dns
 
 import (
-	"context"
 	"fmt"
-	"net"
 )
 
 var errForInvalidTarget = fmt.Errorf("invalid target address [2001:db8:a0b:12f0::1, error info: address [2001:db8:a0b:12f0::1:443: missing ']' in address")
-
-func replaceNetFunc() func() {
-	oldLookupHost := lookupHost
-	oldLookupSRV := lookupSRV
-	oldLookupTXT := lookupTXT
-	lookupHost = func(ctx context.Context, host string) ([]string, error) {
-		return hostLookup(host)
-	}
-	lookupSRV = func(ctx context.Context, service, proto, name string) (string, []*net.SRV, error) {
-		return srvLookup(service, proto, name)
-	}
-	lookupTXT = func(ctx context.Context, host string) ([]string, error) {
-		return txtLookup(host)
-	}
-	return func() {
-		lookupHost = oldLookupHost
-		lookupSRV = oldLookupSRV
-		lookupTXT = oldLookupTXT
-	}
-}