Update to csi-lib-utils@v0.15.0

Manually update to csi-lib-utils@v0.15.0

It was necessary to update to kubernetes-csi/csi-test@v5.1.0 to remove dependency on cloud.google.com/go@v0.34

vendor/github.com/kubernetes-csi/csi-test/v5/utils/grpcutil.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2017 The Kubernetes 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 utils
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/url"
+	"time"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/connectivity"
+)
+
+// Connect address by grpc
+func Connect(address string, dialOptions ...grpc.DialOption) (*grpc.ClientConn, error) {
+	u, err := url.Parse(address)
+	if err == nil && (!u.IsAbs() || u.Scheme == "unix") {
+		dialOptions = append(dialOptions,
+			grpc.WithDialer(
+				func(addr string, timeout time.Duration) (net.Conn, error) {
+					return net.DialTimeout("unix", u.Path, timeout)
+				}))
+	}
+
+	conn, err := grpc.Dial(address, dialOptions...)
+	if err != nil {
+		return nil, err
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+	for {
+		if !conn.WaitForStateChange(ctx, conn.GetState()) {
+			return conn, fmt.Errorf("Connection timed out")
+		}
+		if conn.GetState() == connectivity.Ready {
+			return conn, nil
+		}
+	}
+}