Bug 1290 - Swagger Documentation is failing to load - java script

Bug 1290 - Swagger Documentation is failing to load - java script
exception

Fixed how we generated the json model representing yang union types
Fixed json model naming for nested container types.

To validate:
1) deploy fix, and load http://localhost:8080/apidoc/explorer.
2) Verify the page loads and you can expand
opendaylight-inventory:nodes.
3) Search for "node-connector" and expand a node-connector definition.
Verify that the "port-number" type says "integer or string".

Change-Id: I8aae18ba4805c3ee57cbb655807af4f15ee61756
Signed-off-by: Devin Avery <devin.avery@brocade.com>