Cleanup of performance monitoring, custom json serializers, and CLI display support.

...floodlightcontroller/core/web/JacksonCustomConverter.java

...ontroller/core/web/serializers/OFMatchJSONSerializer.java

...er/core/web/serializers/OFPhysicalPortJSONSerializer.java

...erializers/PerfMonCumulativeTimeBucketJSONSerializer.java

...eb/serializers/PerfMonOneComponentTimeJSONSerializer.java

...et/floodlightcontroller/perfmon/CumulativeTimeBucket.java

...va/net/floodlightcontroller/perfmon/OneComponentTime.java

...net/floodlightcontroller/perfmon/PktinProcessingTime.java