Remove default str in `Usage` when `Value` is used
Remove default str in `Usage` when `Value` is used

Signed-off-by: Amir Mofasser <0034ceb6fbb4a8a55690e67852d0bb3db6e51db0@gmail.com>

kubernetes-incubator/cri-o,nalind/cri-o,rhatdan/cri-o,nalind/cri-o,kubernetes-incubator/ocid,rhatdan/cri-o,mikebrow/cri-o,mikebrow/cri-o,kubernetes-incubator/ocid,nalind/cri-o,kubernetes-incubator/ocid,rhatdan/cri-o,mikebrow/cri-o,kubernetes-incubator/cri-o,rhatdan/cri-o,mikebrow/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o