Change way we calculate backend_id for bare metals
Change way we calculate backend_id for bare metals

Because backend.title can be changed, but the machine's name
can't.

afivos/mist.io,johnnyWalnut/mist.io,zBMNForks/mist.io,johnnyWalnut/mist.io,afivos/mist.io,DimensionDataCBUSydney/mist.io,afivos/mist.io,DimensionDataCBUSydney/mist.io,kelonye/mist.io,DimensionDataCBUSydney/mist.io,kelonye/mist.io,Lao-liu/mist.io,zBMNForks/mist.io,munkiat/mist.io,munkiat/mist.io,kelonye/mist.io,Lao-liu/mist.io,zBMNForks/mist.io,munkiat/mist.io,johnnyWalnut/mist.io,Lao-liu/mist.io,DimensionDataCBUSydney/mist.io,Lao-liu/mist.io,munkiat/mist.io