Add address_type argument for backends

[javl]

Thanks for this wrapper. I wanted to use it with a completely different device (from miflora), one that needs the 'random' address type instead of 'public'.

I've added an additional argument to the bluetooth interface to allow this. The default is still 'public' so BluetoothInterface(backend, adapter) is equal to BluetoothInterface(backend, adapter, address_type='public') meaning scripts implementing btewrap without the argument will still work the same, but it also allows you run run BluetoothInterface(backend, adapter, address_type='random') to use the random address type.

I've implemented this in all three backends but was only able to test with bluepy and gatttool as pygatt doesn't seem to work on my system. I think it should work, maybe you can take a look and confirm this?

[coveralls]

Pull Request Test Coverage Report for Build 30

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[ChristianKuehnel]

Thx! Just gave it a test and the change works for me as well (with a few smaller changes), see #12.

I'm closing this PR and will merge #12 when the build succeeds.