This changes the HTTP log format slightly but shouldn't mess
up anything that anyone was doing because the old "filename"
field was never actually filled out. Tests are updated as well.
- Rename event "socks_login_userpass" to "socks_login_userpass_request"
- Rename event "socks_login_reply" to "socks_login_userpass_reply"
- Split unsupported authN weird into 2 types: method vs. version
Addresses BIT-1011