[compat api] Remove ContainerConfig field

ContainerConfig has been removed from v1.45

InspectResponse.Container has also been removed but it seems we never implemented it.

Ref: https://docs.docker.com/reference/api/engine/version-history/#v145-api-changes
Signed-off-by: Lewis Roy <lewis@redhat.com>

test/apiv2/python/rest_api/test_v2_0_0_image.py

@@ -23,7 +23,6 @@ class ImageTestCase(APITestCase):
             "SharedSize",
             "VirtualSize",
             "Labels",
-            "Containers",
         )
         images = r.json()
         self.assertIsInstance(images, list)
@@ -45,7 +44,6 @@ class ImageTestCase(APITestCase):
             "Parent",
             "Comment",
             "Created",
-            "Container",
             "DockerVersion",
             "Author",
             "Architecture",