Evaluate aexpect replacements

[lmr]

Although we don't need to do it in a hurry, I'd like to take a look in possible replacements for the aexpect code. Pros:

1. We won't have to maintain it

Cons:

1. We'd depend on some 3rd party libraries, that might not be very well available

In any case, this is the first I'd like to look at

http://liftoff.github.io/GateOne/Developer/termio.html

[lmr]

https://github.com/liftoff/GateOne/blob/master/termio/termio.py