Refactor re-use Access Point

[otorreno]

Is this a bug fix or adding new feature?
Refactor of existing feature

What is this PR about? / Why do we need it?
When reuse access point flag is set to true, there is no point in doing a lot of work that is aimed at preparing the options for the createAccessPoint call (e.g. allocating a GID). We can save quite some time and quite some API calls if the AP with the same clientToken is found. The check for the AP existence has been moved from the CreateAccessPoint function one level up. The controller in this case checks if there is an access point with such client token, if so, it proceeds to return a CreateVolumeResponse. If it is not found, then it follows the usual flow.

What testing is done?
Coverage with unit tests

[k8s-ci-robot]

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[otorreno]

@mskanth972 another change to reduce API calls. This time when reuseAccessPoint is set to true

[otorreno]

@d-nishi / @jqmichael maybe you have a chance to review it?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: otorreno
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[otorreno]

@mskanth972 can you PTAL?

[k8s-ci-robot]

PR needs rebase.

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