Output test description in TestPreemption

Now we are facing flake test of TestPreemption due to less available
node. TestPreemption consists of multiple test cases and the resource
is shared in them.
At this time, we cannot see what test cases run before the flake
happens. So it is better to know that to distinguish the cleanup of
pods is not completed or not.

Author: Kenichi Omichi

test/integration/scheduler/preemption_test.go

@@ -392,6 +392,7 @@ func TestPreemption(t *testing.T) {
 	}
 
 	for _, test := range tests {
+		t.Logf("================ Running test: %v\n", test.description)
 		filter.Tokens = test.initTokens
 		filter.Unresolvable = test.unresolvable
 		pods := make([]*v1.Pod, len(test.existingPods))
@@ -583,6 +584,7 @@ func TestPodPriorityResolution(t *testing.T) {
 
 	pods := make([]*v1.Pod, 0, len(tests))
 	for _, test := range tests {
+		t.Logf("================ Running test: %v\n", test.Name)
 		t.Run(test.Name, func(t *testing.T) {
 			pod, err := runPausePod(cs, test.Pod)
 			if err != nil {