Fix broken client-example.go

[vinaykakade]

With the recent changes in the repo (#110), I found that client-example.go no longer works. There are two issues:
(1) With having 'matrics\n - accuracy' in study-config, the CreateStudy request no longer is successful. Until the underlying cause is found/fixed, removing it from study-config. Let me know in case replacing it with something else works.
(2) Even after the workers terminate successfully, the client-example.go is no longer able to detect their termination and keeps on running in an infinite loop. Reverted to the original terminal condition change which works correctly.

/assign @YujiOshima

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
To fully approve this pull request, please assign additional approvers.
We suggest the following additional approver: yujioshima

Assign the PR to them by writing /assign @yujioshima in a comment when ready.

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[YujiOshima]

I have no error on client-example.go.
Maybe there is some mismatch between client and server.
Which docker image do you use for vizier-core?

[lluunn]

I was also able to run client-example.go (last week)

[vinaykakade]

Thanks, I'll check for the mismatch between client and server.

[jlewi]

/ok-to-test

[jlewi]

@vinaykakade Were you successful?

[vinaykakade]

Yes, was able to run it long ago. Apologies for not reporting this sooner. Will close this PR.

[wukong1992]

@vinaykakade How did you solve it?

[vinaykakade]

The issue was mismatched images in dockerhub and the tip of master. I had to rebuild the images, upload them to an image repository we use, and point the manifest for vizier-core to pull the image from our repository instead of dockerhub.