Eliminate the logging of "incomplete headers (0 bytes) received from server" when a client aborts.
Eliminate the logging of "incomplete headers (0 bytes) received from
server" when a client aborts.

Remove STATE_CLIENT_ERROR from npipe_io() - it didn't do anything
useful (now use STATE_ERROR instead).

hollow/mod_fastcgi_handler,Gandi/mod_fastcgi_handler,Gandi/mod_fastcgi_handler