Review fixes for 'Created metric class'

- Changed metric to_json to dumpConfiguration returning LabeledTuple
- LabeledTuple can be created and assigned directly to json
- LabeledTuple can be readed from json using json.get<LabeledTuple>
- Added PrintTo for LabeledMetricParams, LabeledSensorParams
- Added helper method expectMake to ReportFactoryMock
- sensorPaths are serialized to tuple<service, path> instead of single
  field with service and path separated via ':'
- Changed configuration version from 1 to 2

Change-Id: I7c45fb584687172f88fd549a93329264793b0b8e
Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
diff --git a/src/report.hpp b/src/report.hpp
index b227392..c58d38b 100644
--- a/src/report.hpp
+++ b/src/report.hpp
@@ -75,5 +75,5 @@
         "/xyz/openbmc_project/Telemetry/Reports/";
     static constexpr const char* deleteIfaceName =
         "xyz.openbmc_project.Object.Delete";
-    static constexpr size_t reportVersion = 1;
+    static constexpr size_t reportVersion = 2;
 };