Stop logging on otherwise acceptable responses
Stop logging on otherwise acceptable responses

cloudera/hue developers were seeing a large number of log errors for
200 status code responses. Instead of slowly growing a list of status codes
to not log an error message for, let's just not log the message if the response
code is "ok" (`200 <= status_code < 400`, vaguely speaking).
rbcarson/requests-kerberos,AbsoluteMSTR/requests-kerberos,requests/requests-kerberos,requests/requests-kerberos