Annotate pod with ovs-hw-offload status

[zshi-redhat]

When pod is created with a switchdev VF device (ovs-hw-offload enabled pod) there is not an easy way for user to tell whether it is a regular pod or hw-offloaded pod.

In order to check the pod is using ovs-hw-offload, user has to do the following steps:

1. check the net-attach-def via the pod annotation: v1.multus-cni.io/default-network: <net-attach-def-name>
2. query the net-attach-def through API
3. check if the net-attach-def contains the resourceName annotation

instead of user checking net-attach-def, ovn-kubernetes cni can annotate the pod with a tag to indicate the pod is offloaded: for example k8s.ovn.org/ovs-hw-offload: true

This annotation can be further enhanced to a json string that contains both enablement and ovs tc-policy info: k8s.ovn.org/ovs-hw-offload: '{"enabled": "true", "ovs-tc-policy": "none"}'

[zshi-redhat]

/cc @moshe010

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