Fixed LearningSwitch unit tests and a couple bugs found in the code as a result.

...t/floodlightcontroller/learningswitch/LearningSwitch.java

...t/java/net/floodlightcontroller/debugevent/EventTest.java

.../java/net/floodlightcontroller/firewall/FirewallTest.java

...oodlightcontroller/learningswitch/LearningSwitchTest.java

...t/floodlightcontroller/loadbalancer/LoadBalancerTest.java

...floodlightcontroller/staticflowentry/StaticFlowTests.java