This should fix the problem where we see the first test
taking negative time, as well as possibly other issues
with performance tests which may be sensitive to changes
in wall clock time.

Fixes #398

wait for switches to connect during test_nets

Merge branch 'patches/linear_bw' of https://github.com/cdburkard/mininet into cdburkard-patches/linear_bw

Merge branch 'patches/fix_sshd' of https://github.com/cdburkard/mininet into cdburkard-patches/fix_sshd

check for vlan dependency

continue to test cfs if rt is not enabled in kernel

This should help with #393 although it doesn't solve
the root issue of the example failing silently when
vconfig is missing.

add 1ms delay to all links to exaggerate TCP bandwidth decrease across an increasing number of links

Conflicts:
	examples/cpu.py

workaround: attach to cgroup first, then mount namespace

add Ryu controller support to Mininet

Skip test_cpu.py if RT_GROUP_SCHED is not enabled

use udp with iperf to measure loss. pings are not reliable

measure loss with udp iperf

This should more reliably shut down pexpect subprocesses when
build.py exits before completion.

Switch to loxigen-built openflow.lua wireshark plugin

Apparently there is a conflict where the lua plugin
conflicts with the built-in dissector for openflow
that is included with 1.12 and up. For now, we will
just not install the plugin. This should fix the
14.10 VM build.

Additionally, I have added a handy function,
version_ge, which compares version numbers in
canonical x.y.z format. Thanks to stackoverflow for
pointing out the incredibly useful sort -V option!