Bug 1441: Added proper handling of reading JSON list items.

Fixed handling of reading nested data in JSON codec.

Initial integration contained bug, which did use JSON
codec correctly, which ended in 500 for reading list item.

Change-Id: I38ef0b40cea1a22e313d22f64db3806c293d67d6
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>