Integration and/or unit test for recovery device

[isaacvr]

Feature description

Is required to write some tests to check that device recovery command is working properly.

Is your feature request related to a problem? Please describe.
Currently the device recovery have not any automated test

Describe the solution you'd like
Implement such test

Additional context

https://github.com/skycoin/hardware-wallet/blob/8a2c42f4a79d0deeb3f7bd776b56c126cf7322c8/tiny-firmware/firmware/recovery.c#L430-L447

https://github.com/skycoin/hardware-wallet/blob/8a2c42f4a79d0deeb3f7bd776b56c126cf7322c8/tiny-firmware/firmware/recovery.c#L140-L149

As you can see the device is not sending feedback info about the required next word through the wire, this info is show only in the device screen. You can confirm this looking at the WordRequest protobuf message too.

It's very important to note that you can not add this info to the message because this will break(reveal) the random order for word request, this is an important security issue.

Possible implementation
To be finined