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/github.com/google/cadvisor/stats/noop.go

@@ -0,0 +1,44 @@
+// Copyright 2020 Google Inc. All Rights Reserved.
+//
+// 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.
+
+// Noop perf Manager and Collector.
+package stats
+
+import (
+	"k8s.io/klog/v2"
+
+	v1 "github.com/google/cadvisor/info/v1"
+)
+
+type NoopManager struct {
+	NoopDestroy
+}
+
+type NoopDestroy struct{}
+
+func (nsd NoopDestroy) Destroy() {
+	klog.V(5).Info("No-op Destroy function called")
+}
+
+func (m *NoopManager) GetCollector(cgroup string) (Collector, error) {
+	return &NoopCollector{}, nil
+}
+
+type NoopCollector struct {
+	NoopDestroy
+}
+
+func (c *NoopCollector) UpdateStats(stats *v1.ContainerStats) error {
+	return nil
+}

e2e/vendor/github.com/google/cadvisor/stats/types.go

@@ -0,0 +1,35 @@
+// Copyright 2020 Google Inc. All Rights Reserved.
+//
+// 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.
+
+// Handling statistics that are fully controlled in cAdvisor
+package stats
+
+import info "github.com/google/cadvisor/info/v1"
+
+// This is supposed to store global state about an cAdvisor metrics collector.
+// cAdvisor manager will call Destroy() when it stops.
+// For each container detected by the cAdvisor manager, it will call
+// GetCollector() with the devices cgroup path for that container.
+// GetCollector() is supposed to return an object that can update
+// external stats for that container.
+type Manager interface {
+	Destroy()
+	GetCollector(deviceCgroup string) (Collector, error)
+}
+
+// Collector can update ContainerStats by adding more metrics.
+type Collector interface {
+	Destroy()
+	UpdateStats(*info.ContainerStats) error
+}