Handle KeyboardInterrupt in Asyncio services

[gsalgado]

Closes: #62

[pipermerriam]

To extend on the previous comment, you probably want to consider something like this.

Anywhere that we have

try:
    ...
except Exception:
    ...

You can update to either of:

try:
    ...
except Exception:
    ...
except BaseException:
    ...  # if you need separate exception logic for KeyboardInterrupt

or this if the logic should be the same.

try:
    ...
except BaseException:
    ...