addtestusers cli endpoint does not await the coroutine

[rambo]

With the orm changes create_test_users became a coroutine

./rasenmaeher_api -v addtestusers
<coroutine object create_test_users at 0x7f9438fca650>
sys:1: RuntimeWarning: coroutine 'create_test_users' was never awaited
RuntimeWarning: Enable tracemalloc to get the object allocation traceback