Merge pull request #67 from ryanpetrello/linux

Update `ifconfig` parsing to support Linux format.
Merge pull request #70 from ryanpetrello/linux

Add tests for `ifconfig.InterfaceManager.get_management_address()`
Sysctl to disable accept_dad on managment interface
Merge pull request #71 from jordant/linux

Sysctl to disable accept_dad on managment interface
Resolve ifconfig/bird6/dnsmasq BSD -> Linux-isms.