If lxc_add_state_client() is called with the container already being in
the desired state the client fd will never be closed and is leaking.
This due to setting stay_connected in lxc_cmd for
LXC_CMD_ADD_STATE_CLIENT. If the desired state isn't already achieved
the client fd will later be closed by calling lxc_cmd_fd_cleanup() but
in the other case the client configuration isn't added to the handlers
state clients. So the client fd has to be closed explicitely.

This is simply tested by starting container A and calling lxc-wait -n A
-s RUNNING.
Signed-off-by: Matthias Hardt <matthias.hardt@gmail.com>