Change expected event items to 4 in order to support new binary session
token item. Parsing of the session token will be implemented later.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Define `SetEACL` structure of eACL table change notification from Container
contract. Implement function which parses `SetEACL` event structure from
stack item list.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>