Add unit test for func RenderInstanceGroupSubnets in instancegroup.go

[fenggw-fnst]

Signed-off-by: Guangwen Feng fenggw-fnst@cn.fujitsu.com

[k8s-ci-robot]

Hi @fenggw-fnst. 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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[johngmyers]

/ok-to-test
Looks like you need to merge in master or rebase to pass the checks on license year.

[fenggw-fnst]

@johngmyers Done, thanks!

[johngmyers]

Thanks!
/lgtm

[rifelpet]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fenggw-fnst, rifelpet

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