Deregister elb targets before registering targets

[DanielCKennedy]

What type of PR is this?

/kind bug

What this PR does / why we need it:

NLB's with the the max number of targets in a target group are unable to perform node replacements due to "TooManyTargets" errors short-circuiting the ensureTargetGroupTargets() function during registration, preventing the deregister action from happening.

error trying to register targets in target group: \"TooManyTargets: You cannot have more than 1000 targets per network load balancer with cross-zone load balancing enabled.

This change will perform the deregister operation before the register operation to prevent deadlock on NLB's with quota pressure.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fixed bug that prevented target deregistrations from occurring on Load Balancer target groups with quota pressure by processing deregistrations before registrations

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @DanielCKennedy. 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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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[kmala]

/ok-to-test