fix(scheduler): the session cleanup generator is reset too often (#2220)

This causes the "fair" scheduler to run it too often in the detriment of other generators.
The intention was to run it every 2 hours but the measurement unit for 7200 was not specified.

Add more logs, including showing a generator name, in order to troubleshoot this kind of issues easier in the future.

Signed-off-by: Andrei Aaron <aaaron@luxoft.com>

pkg/extensions/sync/sync.go

@@ -90,6 +90,10 @@ func NewTaskGenerator(service Service, log log.Logger) *TaskGenerator {
 	}
 }
 
+func (gen *TaskGenerator) Name() string {
+	return "SyncGenerator"
+}
+
 func (gen *TaskGenerator) Next() (scheduler.Task, error) {
 	if err := gen.Service.SetNextAvailableURL(); err != nil {
 		return nil, err