Add GET method for Triggers

Added GET method for retrieving details of individual Trigger searched
by given Trigger name, details are extracted from Telemetry service

Tested:
- Added single Trigger and requested result from bmcweb via
  /redfish/v1/TelemetryService/Triggers/<triggername>
- Added multiple Triggers numeric and discrete with various parameters
  (empty, non-empty), and requested results from bmcweb via
  /redfish/v1/TelemetryService/Triggers/<triggername>
- Verified uris /redfish/v1/TelemetryService/Triggers/<triggername> by
  using Redfish-Service-Validator (all passed)

Signed-off-by: Lukasz Kazmierczak <lukasz.kazmierczak@intel.com>
Change-Id: I1c966b2f792324cc6f6a8784ad18a683e5ce7bd9
diff --git a/static/redfish/v1/JsonSchemas/index.json b/static/redfish/v1/JsonSchemas/index.json
index 86c5342..8811f26 100644
--- a/static/redfish/v1/JsonSchemas/index.json
+++ b/static/redfish/v1/JsonSchemas/index.json
@@ -4,7 +4,7 @@
   "@odata.type": "#JsonSchemaFileCollection.JsonSchemaFileCollection",
   "Name": "JsonSchemaFile Collection",
   "Description": "Collection of JsonSchemaFiles",
-  "Members@odata.count": 57,
+  "Members@odata.count": 58,
   "Members": [
     {
       "@odata.id": "/redfish/v1/JsonSchemas/AccountService"
@@ -157,6 +157,9 @@
       "@odata.id": "/redfish/v1/JsonSchemas/Thermal"
     },
     {
+      "@odata.id": "/redfish/v1/JsonSchemas/Triggers"
+    },
+    {
       "@odata.id": "/redfish/v1/JsonSchemas/UpdateService"
     },
     {