Remove cancel pull big image test

This test doesn't make too much sense anymore, because
the pulls are independent from one another.

executor/mock/standalone/standalone_test.go

@@ -49,10 +49,6 @@ var (
 		name: "titusoss/by-digest",
 		tag:  "latest",
 	}
-	bigImage = testImage{
-		name: "titusoss/big-image",
-		tag:  "20171025-1508900976",
-	}
 	noEntrypoint = testImage{
 		name: "titusoss/no-entrypoint",
 		tag:  "20180501-1525157430",
@@ -87,7 +83,6 @@ func TestStandalone(t *testing.T) {
 		testNoEntrypoint,
 		testCanWriteInLogsAndSubDirs,
 		testShutdown,
-		testCancelPullBigImage,
 		testMetadataProxyInjection,
 		testMetdataProxyDefaultRoute,
 		testTerminateTimeout,
@@ -323,48 +318,6 @@ func testImagePullError(t *testing.T, jobID string) {
 	}
 }
 
-func testCancelPullBigImage(t *testing.T, jobID string) { // nolint: gocyclo
-	jobRunner := mock.NewJobRunner()
-
-	testResultBigImage := jobRunner.StartJob(&mock.JobInput{
-		JobID:     jobID,
-		ImageName: bigImage.name,
-		Version:   bigImage.tag,
-	})
-
-	select {
-	case taskStatus := <-testResultBigImage.UpdateChan:
-		if taskStatus.State.String() != "TASK_STARTING" {
-			t.Fatal("Task never observed in TASK_STARTING, instead: ", taskStatus)
-		}
-	case <-time.After(15 * time.Second):
-		t.Fatal("Spent too long waiting for task starting")
-	}
-
-	if err := jobRunner.KillTask(); err != nil {
-		t.Fatal("Could not stop task: ", err)
-	}
-	timeOut := time.After(30 * time.Second)
-	for {
-		select {
-		case taskStatus := <-testResultBigImage.UpdateChan:
-			//		t.Log("Observed task status: ", taskStatus)
-			if taskStatus.State.String() == "TASK_RUNNING" {
-				t.Fatalf("Task %s started after killTask %v", testResultBigImage.TaskID, taskStatus)
-			}
-			if taskStatus.State.String() == "TASK_KILLED" || taskStatus.State.String() == "TASK_LOST" {
-				t.Logf("Task %s successfully terminated with status %s", testResultBigImage.TaskID, taskStatus.State.String())
-				goto big_task_killed
-			}
-		case <-timeOut:
-			t.Fatal("Cancel failed to stop job in time")
-		}
-	}
-big_task_killed:
-	// We do this here, otherwise  a stuck executor can prevent this from exiting.
-	jobRunner.StopExecutor()
-}
-
 func testBadEntrypoint(t *testing.T, jobID string) {
 	ji := &mock.JobInput{
 		ImageName:  alpine.name,