Data structures for REST API added

...oodlightcontroller/loadbalancer/ILoadBalancerService.java

...floodlightcontroller/loadbalancer/L7PoliciesResource.java

.../java/net/floodlightcontroller/loadbalancer/L7Policy.java

...floodlightcontroller/loadbalancer/L7PolicySerializer.java

...in/java/net/floodlightcontroller/loadbalancer/L7Rule.java

...t/floodlightcontroller/loadbalancer/L7RuleSerializer.java

...et/floodlightcontroller/loadbalancer/L7RulesResource.java

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

...a/net/floodlightcontroller/loadbalancer/LoadBalancer.java

...lightcontroller/loadbalancer/LoadBalancerWebRoutable.java