Add OpenCensus and gopsutil as dependency

[xueweiz]

These two libraries are needed for #275 to compile.

The changes were made & merged first at #286 . But since then, NPD has switched from Godep to Go Modules (#287 ). This change is re-adding these libraries using Go Modules.

Test: rebase #275 on top of this, and then #275 compiles correctly.

[k8s-ci-robot]

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[xueweiz]

This is also part of #284

[xueweiz]

/assign @wangzhen127
/cc @andyxning

[andyxning]

/ok-to-test

[andyxning]

The changes were made & merged first at #286 . But since then, NPD has switched from Godep to Go Modules (#287 ). This change is re-adding these libraries using Go Modules.

If go modules are added after #286, then these packages should be transformed to go modules. Anyway, let's ensure that they are added by go modules.

@xueweiz Thanks for the job.

[andyxning]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyxning, xueweiz

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[xueweiz]

Thanks so much for the prompt review @andyxning !

If go modules are added after #286, then these packages should be transformed to go modules.
Yeah, but the problem is that as part of #287 , the unused libraries (i.e. included in /vendor, but not imported any where) got trimmed.
The code that imports OpenCensus and gopsutil are still in the review queue. So these two libraries got identified as unused libraries, and got deleted :)

[andyxning]

The code that imports OpenCensus and gopsutil are still in the review queue. So these two libraries got identified as unused libraries, and got deleted :)

You reminds me. :)