awgtpman: client interface will now detect and use older RPC interfaces

Version 4.0.1 and earlier had 4 testpoint interfaces instead of two. This code autodetects which interfaces are used by awg and switches to the appropriate interface

This is needed to close an issue in cds-crtools.

assigned to @jonathan-hanks

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• 34a0ff51 - awgtpman: Add missing cleanup for client in version check

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merged

mentioned in commit eb0d560b