Add more APIs for SDK

[jinchihe]

From feedback, as done for the kubeflow-tfjob SDK, add more APIs for kubeflow-pytorchjob:

• wait_for_job: Wait for the specified job to finish
• wait_for_condition: Waits until any of the specified conditions occur
• get_job_status: Quick way to get the PyTorchJob status
• is_job_running: Quick way to check if the PyTorchJob status is Running
• is_job_succeeded: Quick way to check if the PyTorchJob status is Succeeded

[coveralls]

Coverage remained the same at 22.97% when pulling e0a5820 on jinchihe:add_wait_sdk_api into 26f9d0c on kubeflow:master.

[jinchihe]

/cc @gaocegege @johnugeorge
Could you please take a look? Thanks a lot!

[gaocegege]

Thanks for your contribution! 🎉 👍

[johnugeorge]

Great.
Do you think, if is_job_running makes more sense than if_job_running? Similarly for if_job_succeeded ?

[jinchihe]

@johnugeorge Great comments. Agree with you, is_job_running better than if_job_running, I'm going to update, and I'm also going to update TFJob side. Thanks!

[jinchihe]

@johnugeorge Updated, Thanks.

[jinchihe]

/retest

[johnugeorge]

@jinchihe Can you please update the PR comment too to reflect the new function names - #240 (comment)

[jinchihe]

@jinchihe Can you please update the PR comment too to reflect the new function names - #240 (comment)

Updated, thanks!

[johnugeorge]

Thanks @jinchihe
/approve

[k8s-ci-robot]

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[johnugeorge]

/lgtm