Fix DestinationRanges update when IP changes

[sugangli]

L4 firewall's DestinationRanges was not being updated when the forwardingrule's IP was updated.

[k8s-ci-robot]

Hi @sugangli. Thanks for your PR.

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[sugangli]

/assign @swetharepakula

[swetharepakula]

/ok-to-test

[swetharepakula]

Thanks Sugang for the bug fix!

Can you add a corresponding unit test for the change. Otherwise LGTM

[swetharepakula]

Thanks for the change!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sugangli, swetharepakula

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