Merge pull request #49914 from yguo0905/shared-pid-ns

Automatic merge from submit-queue (batch tested with PRs 50087, 39587, 50042, 50241, 49914)

Add node e2e test for Docker's shared PID namespace

Ref: https://github.com/kubernetes/kubernetes/issues/42926

This PR adds a simple test for the shared PID namespace that's enabled when Docker is 1.13.1+.

/sig node
/area node-e2e
/assign @yujuhong 

**Release note**:
```
None
```

test/e2e_node/BUILD

@@ -14,6 +14,7 @@ go_library(
         "benchmark_util.go",
         "container.go",
         "doc.go",
+        "docker_util.go",
         "gpus.go",
         "image_list.go",
         "node_problem_detector_linux.go",
@@ -39,6 +40,8 @@ go_library(
         "//test/e2e/framework/metrics:go_default_library",
         "//test/e2e/perftype:go_default_library",
         "//test/e2e_node/perftype:go_default_library",
+        "//vendor/github.com/blang/semver:go_default_library",
+        "//vendor/github.com/docker/docker/client:go_default_library",
         "//vendor/github.com/golang/glog:go_default_library",
         "//vendor/github.com/google/cadvisor/client/v2:go_default_library",
         "//vendor/github.com/google/cadvisor/info/v2:go_default_library",
@@ -71,6 +74,7 @@ go_test(
         "critical_pod_test.go",
         "density_test.go",
         "disk_eviction_test.go",
+        "docker_test.go",
         "dockershim_checkpoint_test.go",
         "dynamic_kubelet_configuration_test.go",
         "e2e_node_suite_test.go",
@@ -118,7 +122,6 @@ go_test(
         "//test/e2e_node/services:go_default_library",
         "//test/e2e_node/system:go_default_library",
         "//test/utils:go_default_library",
-        "//vendor/github.com/blang/semver:go_default_library",
         "//vendor/github.com/coreos/go-systemd/util:go_default_library",
         "//vendor/github.com/davecgh/go-spew/spew:go_default_library",
         "//vendor/github.com/golang/glog:go_default_library",