Adds iperf timeout for bandwith measurements.

measurement_main.py

                     self.config["port"],
                 )
                 try:
-                    subprocess.call(iperf_command, timeout=time + 1)
+                    subprocess.call(iperf_command, timeout=float(time) + 1)
                 except:
                     print_message("iPerf timed out. Going ahead with next measurement...")
                 processHandler.kill_all()
                     "--one-off",
                 ]
                 try:
-                    subprocess.call(iperf_command, timeout=time + 1)
+                    subprocess.call(iperf_command, timeout=float(time) + 1.0)
                 except:
                     print_message("iPerf timed out. Going ahead with next measurement...")
                 sleep(2)
                     tcp_algo[congestion_control_index],
                 ]
                 try:
-                    subprocess.call(iperf_command, timeout=time + 2)
+                    subprocess.call(iperf_command, timeout=float(time) + 2)
                 except:
                     print_message("iPerf timed out. Going ahead with next measurement...")
                 sleep(4)
                 )
                 sleep(2)
                 try:
-                    subprocess.call(iperf_command, timeout=time+2)
+                    subprocess.call(iperf_command, timeout=float(time)+2)
                 except:
                     print_message("iPerf timed out. Going ahead with next measurement...")
                 processHandler.kill_all()