Standerdise the controller workflow

[Karthik-K-N]

/kind feature
/area provider/ibmcloud

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CAPI has now updated to contain many more helper functions which can be used in our controller to make it more standard and more readable, There are helper functions to add finalisers, to verify if the resource is paused or not and many more.
Reference to one of the controller from CAPI: cluster controller

May be we should spend some time to clean up our controller logic and make the workflow standard across various controller.

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