intel / multus-cni / 781

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Continue to process cmdDel() in case of no network namespace

K8s with docker runtime, cmdDel() is invoked with empty network
namespace in case of restart node. Currently multus just returns
but CNI spec mention that we should invoke CNI plugin to cleanup.

This PR deletes "return nil" and proceeds to invoke CNI plugins
DEL. Fix #323.

2 of 2 new or added lines in 1 file covered. (100.0%)

699 of 1274 relevant lines covered (54.87%)

3.92 hits per line