pkg/cri/server: experimental NRI integration for CRI.

Implement the adaptation interface required by the NRI
service plugin to handle CRI sandboxes and containers.
Hook the NRI service plugin into CRI request processing.

Signed-off-by: Krisztian Litkey <krisztian.litkey@intel.com>

pkg/cri/server/container_remove.go

@@ -73,6 +73,18 @@ func (c *criService) RemoveContainer(ctx context.Context, r *runtime.RemoveConta
 		}
 	}()
 
+	if c.nri.isEnabled() {
+		sandbox, err := c.sandboxStore.Get(container.SandboxID)
+		if err != nil {
+			err = c.nri.removeContainer(ctx, nil, &container)
+		} else {
+			err = c.nri.removeContainer(ctx, &sandbox, &container)
+		}
+		if err != nil {
+			log.G(ctx).WithError(err).Error("NRI failed to remove container")
+		}
+	}
+
 	// NOTE(random-liu): Docker set container to "Dead" state when start removing the
 	// container so as to avoid start/restart the container again. However, for current
 	// kubelet implementation, we'll never start a container once we decide to remove it,