allow for arbitrary kwargs in image client

in order to upload 3 part images with our glance client you need
to allow for passing arbitrary metadata to the image (ramdisk_id
and kernel_id). Remove our kwargs filter to let that happen.

Prereq of blueprint:javelin2

Change-Id: Idff078a2a225a6531b6ce0cf49cb03cc75618e32
diff --git a/tempest/api/image/v2/test_images.py b/tempest/api/image/v2/test_images.py
index 2592409..9eda13e 100644
--- a/tempest/api/image/v2/test_images.py
+++ b/tempest/api/image/v2/test_images.py
@@ -35,11 +35,14 @@
         upload the image file, get image and get image file api's
         """
 
+        uuid = '00000000-1111-2222-3333-444455556666'
         image_name = data_utils.rand_name('image')
         resp, body = self.create_image(name=image_name,
                                        container_format='bare',
                                        disk_format='raw',
-                                       visibility='public')
+                                       visibility='public',
+                                       ramdisk_id=uuid)
+
         self.assertIn('id', body)
         image_id = body.get('id')
         self.assertIn('name', body)
@@ -60,6 +63,7 @@
         self.assertEqual(200, resp.status)
         self.assertEqual(image_id, body['id'])
         self.assertEqual(image_name, body['name'])
+        self.assertEqual(uuid, body['ramdisk_id'])
         self.assertIn('size', body)
         self.assertEqual(1024, body.get('size'))