Make request logs pretty in Python 3 (#5992)
Make request logs pretty in Python 3 (#5992)

Decode response data as UTF-8 to eliminate ugly bytes repr in Python 3.

Resolves #5932
letsencrypt/letsencrypt,lmcro/letsencrypt,stweil/letsencrypt,lmcro/letsencrypt,letsencrypt/letsencrypt,stweil/letsencrypt