made MetricValues persistent

MetricValues are persistent for reportUpdates AppendStopsWhenFull and
reportingType different than OnRequest.

Tested:
- New unit tests are passing
- Confirmed MetricValues are preserved after restarting telemetry
  service

Change-Id: I7e1990fb391da9debb0d7df2f1dbda86473350cc
Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
diff --git a/src/report_factory.hpp b/src/report_factory.hpp
index 8431f40..e8729b1 100644
--- a/src/report_factory.hpp
+++ b/src/report_factory.hpp
@@ -38,7 +38,7 @@
              interfaces::ReportManager& reportManager,
              interfaces::JsonStorage& reportStorage,
              std::vector<LabeledMetricParameters> labeledMetricParams,
-             bool enabled) const override;
+             bool enabled, Readings) const override;
 
   private:
     Sensors getSensors(const std::vector<LabeledSensorInfo>& sensorPaths) const;