Neutron LBaaS: Health Monitor Behaviors

* includes initial BaseLoadBalancersBehaviors class
* commonly used methods for creating, updating and waiting
* contains metatests for de/serialzation in json/xml

Change-Id: Ic4a0704013cb8028958b7a7e3d5ffd6d6b407564
Merge "Neutron LBaaS: Health Monitor Behaviors"