Network metadata/metrics compatible with older server versions Fixes #128

This probably needs some refactoring, but it sets the iface for windows network metrics and is compatible with older versions of windows server

This is currently running on ny-web01 pointing to dev bosun. See os.net.bytes at http://goo.gl/80uLzZ

Yes... most likely would be adding a USB nic. We already are not tracking virtual nics, so this really shouldnt happen very often. I guess we could move the code into the metadata function so it gets called once an hour, just would need to confirm it is called before the c_network_windows.

alternatively it can be a known issue that the service needs to restart if you "hot add" a network adapter