Add pod eviction logic for scheduler preemption

Add Preempt to scheduler interface
Add preemption to the scheduling workflow
Minor changes to the scheduler integration test library

plugin/pkg/scheduler/algorithmprovider/defaults/defaults.go

@@ -155,7 +155,7 @@ func defaultPredicates() sets.String {
 		),
 		// Fit is determined by inter-pod affinity.
 		factory.RegisterFitPredicateFactory(
-			"MatchInterPodAffinity",
+			predicates.MatchInterPodAffinity,
 			func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
 				return predicates.NewPodAffinityPredicate(args.NodeInfo, args.PodLister)
 			},