Adds iperf timeout for bandwith measurements.

measurement_main.py

                     try:
                         try:
                             iperf_return = subprocess.call(iperf_command, timeout=float(time) + TIMEOUT_OFFSET)
-                            is_measurement_done = True
                         except:
-                            print_message("iPerf timed out. Retry...")
+                            print_message("iPerf timed out...")
                             reconnect_modem()
                     except KeyboardInterrupt:
                         exit()
+                    is_measurement_done = True
                 sleep(4)
                 processHandler.kill_all()
                 congestion_control_index = (congestion_control_index + 1) % len(
                     try:
                         try:
                             iperf_return = subprocess.call(iperf_command, timeout=float(time) + TIMEOUT_OFFSET)
-                            is_measurement_done = True
                         except:
-                            print_message("iPerf timed out. Retry...")
+                            print_message("iPerf timed out...")
                             reconnect_modem()
                     except KeyboardInterrupt:
                         exit()
+                    is_measurement_done = True
                 processHandler.kill_all()
                 congestion_control_index = (congestion_control_index + 1) % len(
                     tcp_algo