Neutron LBaaS: Listener Behaviors

* behaviors class for listeners
 * commonly used methods
* includes metatests for de/serialization

Change-Id: Iebef576716b98457fd9600372412d0f33454d54c
Neutron LBaaS: Pools Behaviors

* pool behaviors for commonly used methods
* includes metatests for de/serialization of json/xml

Change-Id: I775fb24f81cbf1b44841060cc5b3b2f15c3394d0
Merge "Neutron LBaaS: Pools Behaviors"
Merge "Neutron LBaaS: Listener Behaviors"