cni: pass pod ID to CNI plugin's add/delete calls
cni: pass pod ID to CNI plugin's add/delete calls

We were passing a virtualEndpoint.NetPair.ID previously.

CNI expects to receive a POD ID when being called.  This patch changes
the CNI calls to provide this behavior.

Signed-off-by: Eric Ernst <5015973303f980f03dfbc137aa86aae091073f95@intel.com>

containers/virtcontainers,containers/virtcontainers