WIP: Fixes mac sched nfapi
MAC scheduler and nFAPI/L2-simulator related fixes. MR review has already been done in !912 (closed). This MR excludes the TUN interface-related changes in a separate branch
MAC scheduler and nFAPI/L2-simulator related fixes. MR review has already been done in !912 (closed). This MR excludes the TUN interface-related changes in a separate branch