Fix HTTP keepalives over SSL.

* flood_net_ssl.c
  (ssl_check_socket): Implement.
* flood_net_ssl.h
  (ssl_check_socket): Declare.
* flood_socket_keepalive.c
  (ksock_check_socket, ksock_close_socket): Declare helper macros.
  (keepalive_begin_conn): Use helper function to call appropriate checker.
  (keepalive_end_conn): Use helper to close socket.


git-svn-id: https://svn.apache.org/repos/asf/httpd/flood/trunk@698796 13f79535-47bb-0310-9956-ffa450edef68