Introduce iperf3 testing infrastructure

Change-Id: I6ff6bef14feb535d98ca41b9788700d699e1ef1e
diff --git a/suites/gprs/suite.conf b/suites/gprs/suite.conf
index 1590b7d..a24bc5d 100644
--- a/suites/gprs/suite.conf
+++ b/suites/gprs/suite.conf
@@ -1,6 +1,6 @@
 resources:
   ip_address:
-  - times: 8 # msc, bsc, hlr, stp, mgw*2, sgsn, ggsn
+  - times: 9 # msc, bsc, hlr, stp, mgw*2, sgsn, ggsn, iperf3srv
   bts:
   - times: 1
   modem: