Add LOG_EVERYTHING envar to ... log everything

There are currently modules that are suted down in the logging configuration, like urllib3 (all HTTP calls) and botocore (S3 related stuff).

To ease debugging, let's add a specific envar: LOG_EVERYTHING.
It will enable logging for everthing and also add even more logging by enabling this code:

import http
http.client.HTTPConnection.debuglevel = 1