Renamed classes to introduce the easier names of AggregationService and IngestionService

...neric/server/plugins/jython/JythonAggregationService.java

...generic/server/plugins/jython/JythonIngestionService.java

...s/generic/server/plugins/standard/AggregationService.java

...dss/generic/server/plugins/standard/IngestionService.java

...ample-jython-aggregation-service-report/plugin.properties

...jython-db-modifying-aggregation-service/plugin.properties

...hon/JythonBasedAggregationServiceReportingPluginTest.java

...ver/plugins/standard/ExampleAggregationServicePlugin.java

...lugins/standard/ExampleDbModifyingAggregationService.java