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

app/Classes/LDAP/Attribute/Factory.php

@@ -26,12 +26,15 @@ class Factory
 		'entrycsn' => Internal\CSN::class,
 		'entrydn' => Internal\DN::class,
 		'entryuuid' => Internal\UUID::class,
+		'etag' => Internal\Etag::class,
 		'gidnumber' => GidNumber::class,
 		'hassubordinates' => Internal\HasSubordinates::class,
 		'jpegphoto' => Binary\JpegPhoto::class,
 		'modifytimestamp' => Internal\Timestamp::class,
 		'modifiersname' => Internal\DN::class,
+		'numsubordinates' => Internal\NumSubordinates::class,
 		'objectclass' => ObjectClass::class,
+		'pwdpolicysubentry' => Internal\PwdPolicySubentry::class,
 		'structuralobjectclass' => Internal\StructuralObjectClass::class,
 		'subschemasubentry' => Internal\SubschemaSubentry::class,
 		'supportedcontrol' => Schema\OID::class,