Write HTTP request log to a single file instead of by-day files
Write HTTP request log to a single file instead of by-day files

Easier for logrotate to work on, more similar to how other logging is being currently done, and `logrotate` will split file into daily chunks.

berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud