create load balancer class and REST interface based on quantum LBaaS proposal...

...oodlightcontroller/loadbalancer/ILoadBalancerService.java

.../java/net/floodlightcontroller/loadbalancer/LBMember.java

...java/net/floodlightcontroller/loadbalancer/LBMonitor.java

...in/java/net/floodlightcontroller/loadbalancer/LBPool.java

...n/java/net/floodlightcontroller/loadbalancer/LBStats.java

...ain/java/net/floodlightcontroller/loadbalancer/LBVip.java

...lightcontroller/loadbalancer/LoadBalancerWebRoutable.java

...et/floodlightcontroller/loadbalancer/MembersResource.java

...t/floodlightcontroller/loadbalancer/MonitorsResource.java

...floodlightcontroller/loadbalancer/PoolMemberResource.java

.../net/floodlightcontroller/loadbalancer/PoolsResource.java

...a/net/floodlightcontroller/loadbalancer/VipsResource.java