Make le-auto pull the requisite things from env vars so we can run against test servers.
Make le-auto pull the requisite things from env vars so we can run against test servers.

This should let us create a harness that won't force us to mess with GitHub or PyPI just to test.

(I haven't tried this commit yet, but you can if you want to get a head start on testing.)
stweil/letsencrypt,thanatos/lets-encrypt-preview,mitnk/letsencrypt,mitnk/letsencrypt,dietsche/letsencrypt,TheBoegl/letsencrypt,brentdax/letsencrypt,TheBoegl/letsencrypt,letsencrypt/letsencrypt,bsmr-misc-forks/letsencrypt,thanatos/lets-encrypt-preview,dietsche/letsencrypt,brentdax/letsencrypt,wteiken/letsencrypt,jsha/letsencrypt,stweil/letsencrypt,bsmr-misc-forks/letsencrypt,jtl999/certbot,DavidGarciaCat/letsencrypt,letsencrypt/letsencrypt,jsha/letsencrypt,wteiken/letsencrypt,lmcro/letsencrypt,jtl999/certbot,twstrike/le_for_patching,lmcro/letsencrypt,twstrike/le_for_patching,DavidGarciaCat/letsencrypt