cri: support blockio class in pod and container annotations

This patch adds support for a container annotation and two separate
pod annotations for controlling the blockio class of containers.

The container annotation can be used by a CRI client:
  "io.kubernetes.cri.blockio-class"

Pod annotations specify the blockio class in the K8s pod spec level:
  "blockio.resources.beta.kubernetes.io/pod"
  (pod-wide default for all containers within)

  "blockio.resources.beta.kubernetes.io/container.<container_name>"
  (container-specific overrides)

Correspondingly, this patch adds support for --blockio-class and
--blockio-config-file to ctr, too.

This implementation follows the resource class annotation pattern
introduced in RDT and merged in commit 893701220.

Signed-off-by: Antti Kervinen <antti.kervinen@intel.com>

vendor/github.com/intel/goresctrl/pkg/blockio/config.go

@@ -0,0 +1,33 @@
+/*
+Copyright 2019-2021 Intel Corporation
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package blockio
+
+// Config contains a blockio configuration.
+type Config struct {
+	// Classes define weights and throttling parameters for sets of devices.
+	Classes map[string][]DevicesParameters `json:",omitempty"`
+}
+
+// DevicesParameters defines Block IO parameters for a set of devices.
+type DevicesParameters struct {
+	Devices           []string `json:",omitempty"`
+	ThrottleReadBps   string   `json:",omitempty"`
+	ThrottleWriteBps  string   `json:",omitempty"`
+	ThrottleReadIOPS  string   `json:",omitempty"`
+	ThrottleWriteIOPS string   `json:",omitempty"`
+	Weight            string   `json:",omitempty"`
+}