cri: add annotations for pod name and namespace

cri-o has annotations for pod name, namespace and container name:
https://github.com/containers/podman/blob/master/pkg/annotations/annotations.go

But so far containerd had only the container name.

This patch will be useful for seccomp agents to have a different
behaviour depending on the pod (see runtime-spec PR 1074 and runc PR
2682). This should simplify the code in:
b2d423695d/pkg/kuberesolver/kuberesolver.go (L16-L27)

Signed-off-by: Alban Crequy <alban@kinvolk.io>

pkg/cri/server/container_create_linux_test.go

@@ -174,6 +174,12 @@ func getCreateContainerTestData() (*runtime.ContainerConfig, *runtime.PodSandbox
 
 		assert.Contains(t, spec.Annotations, annotations.ContainerType)
 		assert.EqualValues(t, spec.Annotations[annotations.ContainerType], annotations.ContainerTypeContainer)
+
+		assert.Contains(t, spec.Annotations, annotations.SandboxNamespace)
+		assert.EqualValues(t, spec.Annotations[annotations.SandboxNamespace], "test-sandbox-ns")
+
+		assert.Contains(t, spec.Annotations, annotations.SandboxName)
+		assert.EqualValues(t, spec.Annotations[annotations.SandboxName], "test-sandbox-name")
 	}
 	return config, sandboxConfig, imageConfig, specCheck
 }