while `ondevice listen` works on python2, `ondevice connect` doesn't

[mreithub]

The problem is the different way stdin behaves in the two python versions.

Find a way to get python2's stdin to reliably give us bytes instead of unicode

[mreithub]

Update: ondevice :echo seems to be working now, but ondevice :ssh doesn't yet (I think it might be a flushing issue)