The new RunNode class is used and ip_address support will be dropped
eventually, replaced by the former.
Change-Id: Ib803d7774cb502c7d07443d7720a7b013684faa8
Since tests running a single MS and several of them are really similar,
generic code handling the test for N concurrent iperf3 sessions is
writen an moved to testlib, and existing and new test use that code.
Change-Id: I57799fde49e6845379cca332eec0a1f70aaecd2b
This way several servers can run sharing same IP address.
default port variable is moved inside class to be available to tests.
Change-Id: Id4eae7cefbb1a18ecf2676f9cb22c60cc91cec7c