minor fix for iperf script for test setup

cmake_targets/autotests/tools/iperf_script_phone

@@ -58,6 +58,6 @@ while true ; do
   fi
 done
 
-print "Starting iperf now..."
+echo "Starting iperf now..."
 
 sudo adb -s $device_id shell /data/local/tmp/iperf ${iperf_args[@]}