[Flaky] Scheduling Statement test failed

[k82cn]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind bug

What happened:

https://travis-ci.com/volcano-sh/volcano/jobs/209668399

• Failure [21.664 seconds]
Job E2E Test
/home/travis/gopath/src/volcano.sh/volcano/test/e2e/job_scheduling.go:26
  Statement [It]
  /home/travis/gopath/src/volcano.sh/volcano/test/e2e/job_scheduling.go:253
  Expected error:
      <*errors.StatusError | 0xc0004def30>: {
          ErrStatus: {
              TypeMeta: {Kind: "", APIVersion: ""},
              ListMeta: {SelfLink: "", ResourceVersion: "", Continue: ""},
              Status: "Failure",
              Message: "podgroups.scheduling.incubator.k8s.io \"st-qj-1\" not found",
              Reason: "NotFound",
              Details: {
                  Name: "st-qj-1",
                  Group: "scheduling.incubator.k8s.io",
                  Kind: "podgroups",
                  UID: "",
                  Causes: nil,
                  RetryAfterSeconds: 0,
              },
              Code: 404,
          },
      }
      podgroups.scheduling.incubator.k8s.io "st-qj-1" not found
  not to have occurred
  /home/travis/gopath/src/volcano.sh/volcano/test/e2e/util.go:445

[TommyLike]

/assign

[k82cn]

seems better after #243 :)