unit tests: protect ring-creation with a separate (possibly shorter) timetrap
unit tests: protect ring-creation with a separate (possibly shorter) timetrap

-> if a ring cannot be started, timetraps of 200s like in api_tx_SUITE lead to unnecessarily long waiting times
digshock/scalaris,seyyed/scalaris,digshock/scalaris,seyyed/scalaris,seyyed/scalaris,seyyed/scalaris,digshock/scalaris,seyyed/scalaris,seyyed/scalaris,tectronics/scalaris,tectronics/scalaris,tectronics/scalaris,digshock/scalaris,digshock/scalaris,tectronics/scalaris,tectronics/scalaris,digshock/scalaris,digshock/scalaris,tectronics/scalaris,seyyed/scalaris,tectronics/scalaris