Neutron LBaaS: Directory Restructure

* refactored directories for better design
* create class type directories where each will have:
  * client
  * behaviors
  * response (model)
  * request (model)
* added behavior file stubs with copyright only

Change-Id: I296005dff9ec73fdffd23f65c8ee94669a7e9175
Merge "Neutron LBaaS: Directory Restructure"