[#706] PEP8 Compliance

If you want me to actually remove the changes from `dht.py`, `market.py` and `transport.py` let me know.
I can also add a test for PEP8 compliance.
Yes and I did that in some places too, but I thought the extra line it adds was unnecessary for the simple short log messages. There are also other places that already kept it on the same line.

Usually I will leave the closing parenths on its own line if the whitespace helps the readability or to give the reader some time to process what just happened, but the next line seemed relevant enough and nothing too crazys going on here:

```python
result = do_something(
    that_takes,
    a_lot,
    of_arguments,
    like_these
)
and_now_for_something_completely_different()

result = do_something(
    relatively_simple_but_just_really_really_really_long)
do_something_somewhat_relevant(result)
```

Let me know how I should handle it.