Cleanup in topology.go

[ahadas]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:

1. Find the minimal thread number within a core using a
   single loop rather than by sorting the thread numbers.
2. Inline getUniqueCoreID#err and Discover#numCPUs variables.
3. Narrow the scope of Discover#coreID and Discover#err variables.

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

Hi @ahadas. Thanks for your PR.

I'm waiting for a kubernetes 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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[ahadas]

Trying to resolve the CLA issue

[php-coder]

/ok-to-test

[ahadas]

Seems I've been added to the group of Authorized CNCF Contributors (Red Hat)

[ahadas]

/assign @derekwaynecarr

[ahadas]

/assign @vishh @ConnorDoyle @sjenning @balajismaniam

[ConnorDoyle]

/approve
/lgtm

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahadas, ConnorDoyle

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