restore lost cni-plugin option
restore lost cni-plugin option

Commit d5b5028c undid part of my pr#953 (cni plugin path). Restore it.

Signed-off-by: Ed Santiago <792d28329de7ed446c01b83f731a071248ffeaf4@redhat.com>

14rcole/cri-o,jwhonce/ocid,mheon/cri-o,vbatts/cri-o,rhatdan/cri-o,14rcole/cri-o,mikebrow/cri-o,jwhonce/ocid,nalind/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/ocid,rhatdan/cri-o,kubernetes-incubator/ocid,mheon/cri-o,umohnani8/cri-o,vbatts/cri-o,mheon/cri-o,14rcole/cri-o,kubernetes-incubator/cri-o,mikebrow/cri-o,vbatts/cri-o,umohnani8/cri-o,rhatdan/cri-o,umohnani8/cri-o,umohnani8/cri-o,kubernetes-incubator/cri-o,vbatts/cri-o,nalind/cri-o,nalind/cri-o,mikebrow/cri-o,kubernetes-incubator/cri-o,14rcole/cri-o,rhatdan/cri-o,mheon/cri-o,kubernetes-incubator/ocid,mikebrow/cri-o,jwhonce/ocid