Revert changes to the acme directory
Revert changes to the acme directory

Only send the Python version in the user agent for the letsencrypt tool.

letsencrypt/letsencrypt,letsencrypt/letsencrypt,jsha/letsencrypt,lmcro/letsencrypt,stweil/letsencrypt,stweil/letsencrypt,jsha/letsencrypt,lmcro/letsencrypt