Update dependencies

vendor/google.golang.org/grpc/naming/go18_test.go

@@ -0,0 +1,41 @@
+// +build go1.8
+
+/*
+ *
+ * Copyright 2017 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package naming
+
+import (
+	"context"
+	"net"
+)
+
+func replaceNetFunc() func() {
+	oldLookupHost := lookupHost
+	oldLookupSRV := lookupSRV
+	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)
+	}
+	return func() {
+		lookupHost = oldLookupHost
+		lookupSRV = oldLookupSRV
+	}
+}