BUG/MINOR: http: log 407 in case of proxy auth

Commit 844a7e7 ("[MEDIUM] http: add support for proxy authentication")
merged in v1.4-rc1 added the ability to emit a status code 407 in auth
responses, but forgot to set the same status in the logs, which still
contain 401.

The bug is harmless, no backport is needed.
1 file changed