Minor code cleanup
use udp with iperf to measure loss. pings are not reliable
examples/simpleperf: Warn in docstring about effects of link settings
These include dropped pings and iperf hanging.
examples: Make simpleperf.py executable
pep8: Fix E127 continuation line over-indented
There are a bunch of these remaining, but I don't think the right course isto 'fix' all of them to make pep8 happy, but instead to either changethe test in pep8 to consider that a continuation line may itself...
rename Topo() methods for consistency: add_node() -> addNode()
Pass code check.
Off by one... I dislike range()
Added simpleperf.py to examples.