Add /eviction subresource.

This is for kubernetes#12611.

Author: mml

pkg/apis/policy/register.go

@@ -50,6 +50,7 @@ func addKnownTypes(scheme *runtime.Scheme) error {
 		&PodDisruptionBudget{},
 		&PodDisruptionBudgetList{},
 		&api.ListOptions{},
+		&Eviction{},
 	)
 	return nil
 }