IBM / ubiquity / 1579

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Fix/ub-1722 soft link issue on uncleared node (#274)

in this PR the issue that is solved is the following:
as part of the mount there is a check made to see if there are any solf links pointing to the desired mount point ( to /ubiquity/WWN) -this is needed in order to not allow 2 pods to be attached to the same PVC.
an issue may accur when one of those soft links is not actually active (for example of a pod moving to another node in the cluster and back to the original one due to shutdowns) - this is what this PR solves.
beside checking if any soft links exists - a check is made to see if the mount point is mounted. if it is then this is a valid solf link and the current mount should fail. otherwise the current mount can continue un-interrupted.

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