Always return "Target transaction accepted" error if the target transation was
either accepted by the moment of command run or during the command
handling. Exit with code 1 in both cases. Adjust TestAwaitUtilCancelTx
correspondingly, allow both cases in test. Simplify the test along the
way, remove useless code.
Close#3365.
Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>