Updates documentation for lbaas-api-and-objmodel-improvement

(https://review.openstack.org/#/c/89903/1)
Adds/updates code samples for Neutron LBaas API v2.0
Fixed formatting in JSON code samples
Updated os-lbaas-ext.wadl file
Updated method names to be more meaningful
Delete the unused file:os-lbaas-ext-origional.wadl
Listener parameters seem to be added properly
Removed unused code samples

Closes-Bug: #1331525

Change-Id: I584d29b47e0d528e146eca3e477e14940377c61f