Linked Clone : Helpers for linked-clone

[bn023052]

What this PR does / why we need it:
These are the helpers needed for linked clone tests

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #
This includes helpers needed for linked clone tests.

1. linked_clone_concurrent_helper.go has methods needed for concurrent operation
2. linked_clone_helper.go has all other methods needed by the test

Testing done:
Yes.
https://gist.github.com/bn023052/a47a7f15ff439ad5571461c5e251d537

Special notes for your reviewer:
/Users/nayakb/go/bin/golangci-lint run --enable=lll --timeout 10m

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: bn023052
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[k8s-ci-robot]

Hi @bn023052. Thanks for your PR.

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