resolving ifaces from mac is restricted to names starting with eth or bond

[Edward Hope-Morley]

The data-port and ext-port config options support providing "<provider>:<portmac>" or "<provider>:<portname>". If a mac address is used instead of port name, the charms try to resolve the name from the mac address but available interface names are filtered by names "eth*" or "bond*" which breaks things if you rename your interfaces to something that is not covered by those filters. It should be safe to resolve mac to iface name without filtering what names are used, providing that we can filter out virtual interfaces.

These patches will also fix the ability to provide multiple mac addresses for the same bridge so as to be able to cover multiple host units of the same services (each with their own respesctive mac addresses.)