Windows Network/Make/Model/Serial/Total Memory metadata

Network metadata for IP address is currently blocked by https://github.com/StackExchange/wmi/issues/5
Network metadata for using same iface tag is blocked by https://github.com/bosun-monitor/scollector/issues/119
All instances of MAC in tags has : removed. Also https://github.com/bosun-monitor/bosun/issues/386 uses the same format. I'm ok with leaving : in but assumed we would want the metadata to match other instances where we use it.