Support pods with containers using host ipc

Add a HostIPC field to the Pod Spec to create containers sharing
the same ipc of the host.

This feature must be explicitly enabled in apiserver using the
option host-ipc-sources.

Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>

pkg/kubelet/dockertools/manager_test.go

@@ -2067,3 +2067,20 @@ func TestGetPidMode(t *testing.T) {
 		t.Errorf("expected host pid mode for pod but got %v", pidMode)
 	}
 }
+
+func TestGetIPCMode(t *testing.T) {
+	// test false
+	pod := &api.Pod{}
+	ipcMode := getIPCMode(pod, "")
+
+	if ipcMode != "" {
+		t.Errorf("expected empty ipc mode for pod but got %v", ipcMode)
+	}
+
+	// test true
+	pod.Spec.HostIPC = true
+	ipcMode = getIPCMode(pod, "")
+	if ipcMode != "host" {
+		t.Errorf("expected host ipc mode for pod but got %v", ipcMode)
+	}
+}