implement PR feedback replace errorf + return with fatalf https://github.com/kubernetes/kubernetes/pull/63662#discussion_r192540370 https://github.com/kubernetes/kubernetes/pull/63662#discussion_r192540457
This moves plugin/pkg/scheduler to pkg/scheduler and plugin/cmd/kube-scheduler to cmd/kube-scheduler. Bulk of the work was done with gomvpkg, except for kube-scheduler main package.