Translate/convert in Services (remove dependency on DeviceContext)

Call DeviceContext.oook() before creating instance of the service (encapsulate to util method). For classes that are currently calling DeviceContext.oook() add parameter to the constructor:
a/ org.opendaylight.openflowplugin.impl.statistics.services.AggregateFlowsInTableService
b/ org.opendaylight.openflowplugin.impl.statistics.services.OpendaylightFlowStatisticsServiceImpl

Call getMessageConverter(key) before creating instance of the service (encapsulate to util method). Add argument ConvertorMessageToOFJava to constructor of class and stop using getDeviceContext():
c/ org.opendaylight.openflowplugin.impl.services.SalExperimenterMessageServiceImpl

org.opendaylight.openflowplugin.api.openflow.device.MessageTranslator<I, O>
a/ org.opendaylight.openflowplugin.impl.translator.AggregatedFlowStatisticsTranslator
b/ org.opendaylight.openflowplugin.impl.translator.FlowRemovedTranslator
c/ org.opendaylight.openflowplugin.impl.translator.FlowRemovedV10Translator
d/ org.opendaylight.openflowplugin.impl.translator.PacketReceivedTranslator (see OPNFLWPLUG-655 PortNumberCache)
e/ org.opendaylight.openflowplugin.impl.translator.PortUpdateTranslator