Fixes for E1 and PDU session usage

Robert Schmidtrequested to merge
fix-e1-pdu-handling into develop

Fix a number of problems in E1 and PDU session handling:

  • For multiple PDU session setup reqs, we send a bearer context setup each time; fix an assert that was triggered on the second bearer context setup message
  • Add a log for E1 bearer context setup, as already done for modification and release
  • If we get a PDU session setup for an existing PDU session, reject it as required by the spec [actually, it says to reject individual PDU sessions; keep it simple for now and reject the entire message, which might not be correct if there is one new PDU session that does not exist]
  • Add a workaround to handle multiple PDU session setup requests that come in quick succession for different PDU sessions
Edited by Robert Schmidt

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