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/sandbox_remove.go

@@ -101,6 +101,13 @@ func (c *criService) RemovePodSandbox(ctx context.Context, r *runtime.RemovePodS
 		log.G(ctx).Tracef("Remove called for sandbox container %q that does not exist", id)
 	}
 
+	if c.nri.isEnabled() {
+		err = c.nri.removePodSandbox(ctx, &sandbox)
+		if err != nil {
+			log.G(ctx).WithError(err).Errorf("NRI pod removal notification failed")
+		}
+	}
+
 	// Remove sandbox from sandbox store. Note that once the sandbox is successfully
 	// deleted:
 	// 1) ListPodSandbox will not include this sandbox.