NaBSL prefix needs to be unique

[shubham-pampattiwar]

We need a unique prefix per NaBSL object so as to avoid scenarios for proper functioning of NaSYNC controller. This would ensure that every NaBSL has a unique S3/object storage URL.

[mpryc]

We need to think about scenario where system administrator would want to enforce prefix.

I think that NAC prefix should be second, just after what user or system/administrator specifies. If nothing is being specified by the user or enforced by the administrator then it's just NAC prefix. This way we will allow nicely to see them in the s3 storage.

Example:
prefix from the Spec (specified by the user or by the system administrator): someprefix
resulting prefix: someprefix--

The part is the original BSL path.