Add the pointer for optional fields.

[Hyzhou]

Signed-off-by: HongYu Zhou [email protected]

/kind cleanup

What this PR does / why we need it:
Fixed all the case about pointers need to be used consistently for optional fields.

Which issue(s) this PR fixes:
Fixes #576

Does this PR introduce a user-facing change?:
NONE

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[Hyzhou]

/assign @robscott

[bowei]

/ok-to-test

[robscott]

Thanks @Hyzhou! This matches my understanding of how we should be handling optional fields. Will leave final LGTM for someone else.

/approve
/cc @danehans @hbagdi

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Hyzhou, robscott

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[danehans]

/lgtm