change repo-path default for release-note generate cmd

[DannyBrito]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR changes repo-path value from release-note generate command when omitted to use temp/<gh-org>-<gh-repo> to prevent issue of trying to clone/update incorrect repo in existing path.
cc: @jeremyrickard

Which issue(s) this PR fixes:

Fixes #3444

Special notes for your reviewer:

Does this PR introduce a user-facing change?

change default value of --repo-path flag from release-note generate to use <tmp>/<gh-org>-<gh-repo>

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @DannyBrito. 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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[jeremyrickard]

/ok-to-test

[xmudrii]

Thank you for your contribution and bearing with us, @DannyBrito!
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DannyBrito, xmudrii

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Needs approval from an approver in each of these files:

• cmd/release-notes/OWNERS [xmudrii]
• pkg/notes/OWNERS [xmudrii]

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