Code review comment for lp://staging/~nuclearbob/ubuntu-power-tests/no-wifi-in-test-upload

It could be useful for a setup with a meter but without a relay, like what
Selene has now. Perhaps the dependency on espeak should be removed since
it's not installed by default. I also wonder if we should have a copy of
ncd_usb.py in this package, or otherwise specify it needs to be around.