(make_server_session): Made static. New argument helper_fd.
(class open_session): New attribute helper_fd.
(do_open_session): Pass helper_fd to make_server_session.
(make_open_session): New argument helper_fd.
(do_exit_shell): Updated calls of channel_send_request. Cosmetic
change to verbose message.
(make_pty): Dup the master fd for both stdin and stdout, and leave
the fd in the pty_info object intact.
(spawn_process): Pass helper_fd to spawn_shell. If we're using a
pty, set ignored_error = EIO on the read state correspondign to
stdout. If we don't have a separate stderr channel, set
channel->sources to 1, not 2.

Rev: src/server_session.c:1.103.2.16
Rev: src/server_session.h:1.20.2.2