This set up allows running a typical osmo-gsm-tester set up with a main
unit (ogt-master) attached to one (or more) slaves where resources are
located and processes are run.
As an example, current config allows running an iperf3 test over an srsLTE
stack using the ZeroMQ backend.
Change-Id: Iac7c0b613048ce332642d3957c55cc7c53b56d42
