changes for testbed
input measurement comment
added udp blast capability
udp blast are named as XY_bla
added some consts and use_iperf3 flag;
todo: test and add iperf3
added iperf3
merged iperf3 changes and create udp test
fix iperf3 - save file in /tmp/browserlab/
iperf udp fixed typo; collect test measurements with tcpdump
append iperf3