unify name style of api/studyjob field whose type is array in v1alpha2 API version

[hougangliu]

now we have some API/filed whose type is array, some of them are named with plural type and some are named with List-suffix (such as below). I think we should name them with same style in v1alpha2 API.

rpc GetStudyList(GetStudyListRequest) returns (GetStudyListReply)
rpc GetTrials(GetTrialsRequest) returns (GetTrialsReply)

type StudyJobStatus struct {
...
Trials []TrialSet json:"trials,omitempty"
...
}
type TrialSet struct {
TrialID string json:"trialid,omitempty"
WorkerList []WorkerCondition json:"workeridlist,omitempty"
}

[johnugeorge]

Closing this issue. Implementation is tracked in #370

/close

[k8s-ci-robot]

@johnugeorge: Closing this issue.

In response to this:

Closing this issue. Implementation is tracked in #370

/close

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