Redfish TelemetryService schema implementation

Now user is able to communicate with Telemetry service using Redfish.
Added TelemetryService, MetricReports, MetricReportCollection,
MetricReportDefinition and MetricReportDefinitionCollection nodes
with GET method support. Added TelemetryService URI to root service.
Implemented communication with backend - Telemetry:
https://github.com/openbmc/telemetry

Added schemes attributes that are supported by Telemetry service
design, ref.:
https://github.com/openbmc/docs/blob/master/designs/telemetry.md

Change introduces function that converts decimal value into
duration format that is described by ISO 8601 and Redfish
specification.

Tested:
 - Tested using romulus and s2600wf images on QEMU
 - Verified DBus method calls to Telemetry service from bmcweb
 - Verified bmcweb responses from new nodes in different cases:
   - Report collection is empty
   - Report collection is filled with artificial data
   - Telemetry service is disabled
 - Verified time_utils::toDurationString() output
 - Passed RedfishServiceValidator.py

Signed-off-by: Wludzik, Jozef <jozef.wludzik@intel.com>
Signed-off-by: Adrian Ambrożewicz <adrian.ambrozewicz@linux.intel.com>
Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
Change-Id: Ie6b0b49f4ef5eeaef07d1209b6c349270c04d570

1 files changed, 2 insertions, 0 deletions

diff --git a/redfish-core/lib/service_root.hpp b/redfish-core/lib/service_root.hpp
index 629280c5ec..3df5ec5ddb 100644
--- a/redfish-core/lib/service_root.hpp
+++ b/redfish-core/lib/service_root.hpp
@@ -68,6 +68,8 @@ class ServiceRoot : public Node
         res.jsonValue["Tasks"] = {{"@odata.id", "/redfish/v1/TaskService"}};
         res.jsonValue["EventService"] = {
             {"@odata.id", "/redfish/v1/EventService"}};
+        res.jsonValue["TelemetryService"] = {
+            {"@odata.id", "/redfish/v1/TelemetryService"}};
         res.end();
     }