*: Implement the List interface for TfJobList

[gaocegege]

Notice: The PR is blocked by #276 , I will rebase after it is merged and remove DO NOT MERGE

The error is caused by the field name in TfJobList:

// TfJobList is a list of TfJobs clusters.
type TfJobList struct {
	metav1.TypeMeta `json:",inline"`
	// Standard list metadata
	// More info: http://releases.k8s.io/HEAD/docs/devel/api-conventions.md#metadata
	Metadata metav1.ListMeta `json:"metadata,omitempty"`
	// Items is a list of TfJobs
	Items []TfJob `json:"items"`
}

The name of field Metadata should be anonymous field.

ERROR: logging before flag.Parse: E0110 16:52:24.998866    3707 runtime.go:66] Observed a panic: &errors.errorString{s:"*v1alpha1.TfJobList does not implement the List interface"} (*v1alpha1.TfJobList does not implement the List interface)

---

This change is 

[k8s-ci-robot]

Hi @gaocegege. Thanks for your PR.

I'm waiting for a kubernetes or tensorflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[coveralls]

Coverage increased (+0.3%) to 30.729% when pulling 9bc8275 on gaocegege:list into 9c93d5f on tensorflow:master.

[coveralls]

Coverage increased (+0.2%) to 30.624% when pulling 5b3d8ea on gaocegege:list into 9c93d5f on tensorflow:master.

[gaocegege]

In this PR, I removed the field name here and updated the client. Then the golinter returns warnings for deepcopy.go. I have to add generated deepcopy file into ignore here

[gaocegege]

#276 was merged. Then I will reset the commits and re-push the changes tomorrow(I am in Shanghai and it is 23:00 now) to be more human-readable.

[coveralls]

Coverage increased (+0.07%) to 30.624% when pulling d9eae19 on gaocegege:list into adc8ab9 on tensorflow:master.

[gaocegege]

I reassembled the commit, and PTAL 😄

[jlewi]

/ok-to-test

[jlewi]

/test all