build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/go.etcd.io/etcd/client/v3/logger.go

@@ -0,0 +1,59 @@
+// Copyright 2016 The etcd 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 clientv3
+
+import (
+	"log"
+	"os"
+
+	"go.etcd.io/etcd/client/pkg/v3/logutil"
+	"go.uber.org/zap/zapcore"
+	"go.uber.org/zap/zapgrpc"
+	"google.golang.org/grpc/grpclog"
+)
+
+func init() {
+	// We override grpc logger only when the environment variable is set
+	// in order to not interfere by default with user's code or other libraries.
+	if os.Getenv("ETCD_CLIENT_DEBUG") != "" {
+		lg, err := logutil.CreateDefaultZapLogger(etcdClientDebugLevel())
+		if err != nil {
+			panic(err)
+		}
+		lg = lg.Named("etcd-client")
+		grpclog.SetLoggerV2(zapgrpc.NewLogger(lg))
+	}
+}
+
+// SetLogger sets grpc logger.
+//
+// Deprecated: use grpclog.SetLoggerV2 directly or grpc_zap.ReplaceGrpcLoggerV2.
+func SetLogger(l grpclog.LoggerV2) {
+	grpclog.SetLoggerV2(l)
+}
+
+// etcdClientDebugLevel translates ETCD_CLIENT_DEBUG into zap log level.
+func etcdClientDebugLevel() zapcore.Level {
+	envLevel := os.Getenv("ETCD_CLIENT_DEBUG")
+	if envLevel == "" || envLevel == "true" {
+		return zapcore.InfoLevel
+	}
+	var l zapcore.Level
+	if err := l.Set(envLevel); err != nil {
+		log.Printf("Invalid value for environment variable 'ETCD_CLIENT_DEBUG'. Using default level: 'info'")
+		return zapcore.InfoLevel
+	}
+	return l
+}