True single stream tests with ping

Again, influenced by the cisco stuff.

I lean towards using udp. Or traceroute. Or something like that
to show traceroute delays over time....
Fix offbyseveral error

Incorrectly expanded to 6 or 5 hosts.

And yes, it looks like we need to clearly distinguish between
multiple hosts when they end up being the same, but this
doesn't fix that problem.
add support for testing lp

LP is more rare than ledbat, but I strongly suspect the ledbat
module is broken. That doesn't mean lp isn't!
Cisco PIE style 5tcp up and 2 6mbit udp flood test

again, aping their existing tests.
This requires also that iperf -u -s be running