Change Rdf::read() to find Auxiliary Resources

Previously this was done by `getMetaData`, but as that calls `read`, it makes more sens eto call it there.
This also makes for more consists return values.

src/Flysystem/Adapter/Rdf.php

@@ -144,6 +144,7 @@ final public function read($path)
                 'size' => strlen($contents), // filesize in bytes,
                 'type' => 'file',
             ];
+            $metaData = array_merge($metaData, $this->findAuxiliaryResources($path));
         } else {
             $metaData = $this->adapter->read($path);
         }
@@ -186,7 +187,7 @@ final public function getMetadata($path)
                 // @CHECKME: Does it make more sense to call `guessMimeType` or should `getMimeType` be called?
                 $metadata = array_merge($metadata, ['mimetype' => $this->guessMimeType($path)], $this->read($path));
             }
-            return array_merge($metadata, $this->findAuxiliaryResources($path));
+            return array_merge($metadata);
         } else {
             return $metadata;
         }

tests/unit/Flysystem/Adapter/RdfTest.php

@@ -285,6 +285,8 @@ public function testRdfAdapterShouldCallInnerAdapterAndGraphWhenNonProxyMethodsA
             'path' => self::MOCK_PATH,
             'size' => 2,
             'type' => 'file',
+            'describedby' => '/mock/path.meta',
+            'acl' => '/mock/path.acl',
         ];
 
         if ($method === 'getMimeType') {