Add some opendj internal attributes. Remove some unused variables in APIController

app/Classes/LDAP/Attribute/Internal/NumSubordinates.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace App\Classes\LDAP\Attribute\Internal;
+
+use App\Classes\LDAP\Attribute\Internal;
+
+/**
+ * Represents an NumSubordinates Attribute
+ */
+final class NumSubordinates extends Internal
+{
+}