“ We are of opinion, however, that the substitution of respondents asked for cannot be granted, since it is apparent that the judge who rendered the order and against whom the writ prayed for, if allowed, is to be directed, is the essential party respondent, however much, when his return to the rule is made, either by his authority, or because of their interest in the result, or as friends of the court, the persons to be adversely affected by the granting of the relief prayed may be heard to sustain the sufficiency of the return when that subject arises for consideration. ”