Store the remote host's IP in svnserve's client info.  Remove the now
unneeded connection parameter from various function signatures.

* subversion/svnserve/server.h
  (client_info_t): add member to store remote IP

* subversion/svnserve/serve.c
  (log_server_error,
   error_create_and_log): remove connection parameter
  (log_fail_and_flush): update caller
  (log_authz_denied,
   handle_config_error,
   authz_check_access,
   lookup_access): remove connection parameter
  (authz_check_access_cb,
   authz_commit_cb,
   must_have_access): update caller
  (add_lock_tokens,
   unlock_paths,
   find_repos): remove connection parameter 
  (commit,
   get_dir,
   lock_many, 
   unlock_many,
   fs_warning_func): update caller
  (get_client_info): init new client_info_t member
  (serve): update caller

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1529755 13f79535-47bb-0310-9956-ffa450edef68