Aerial multi l2

This MR makes the name of the shared memory that is used to communicate between OAI VNF and NVIDIA PNF configurable. This allows that one instance of L1 can be used with multiple instances of L2. See https://developer.nvidia.com/docs/gputelecom/aerial-sdk/text/cubb_quickstart/running_cubb-end-to-end.html#run-multiple-l2-instances-with-single-l1-instance for more info. This will work only with Aerial 23-4 and later. This MR also includes updates related to Aerial 23-4.