Don't create a new connection in khttpd_fcgi_conn_destroy().
Don't create a new connection in khttpd_fcgi_conn_destroy().

- That code try to create a new connection after khttpd_port completes
  shutdown handling.
- This is a temporary fix.  Fault handling of FastCGI module should be
  redesigned.

Taketsuru/khttpd,Taketsuru/khttpd,Taketsuru/khttpd,Taketsuru/khttpd,Taketsuru/khttpd