osmo-gsm-tester: add test case: dynamic timeslot data usage
Make sure that a dynamic timeslot still is usable for data service after switching back from voice operation.
Have a pchan configuration where all pchans are not usable for voice or data, except for a single TCH/F_TCH/H_PDCH.
- First transfer some data to verify PDCH works.
- Do a voice call. Optionally verify that PDCH stops working during the voice call.
- End the voice call, then verify that PDCH works again.
Also do the same for TCH/F_PDCH.