Updated model yang file to use recommended practices found on wiki, then updated...

ODL wiki recommends
- All lists should be in a container
- The name just after the list should be singular since it is the element name not the list name
- The outer container should be plural

Updated yang file to do the recommended things, then updated code to match the updated yang generated bindings.

Change-Id: Idafb6b3205fa5ca5d99acc56c7c2b19b8eb4200f
Signed-off-by: Ryan Vail <r.vail@cablelabs.com>