Add GET method for TriggerCollection

Added GET method for retrieving list of Triggers from Telemetry service

Tested:
- Added single Trigger and requested result from bmcweb via
  /redfish/v1/TelemetryService/Triggers
- Added multiple Triggers numeric and discrete, and requested results
  from bmcweb via /redfish/v1/TelemetryService/Triggers
- Verified uri /redfish/v1/TelemetryService/Triggers by using
  Redfish-Service-Validator with no Triggers/empty Collection (passed)

Signed-off-by: Lukasz Kazmierczak <lukasz.kazmierczak@intel.com>
Change-Id: Ide00eb44901ea1b97b80fc5c5ddfd97e393d4a04
diff --git a/static/redfish/v1/$metadata/index.xml b/static/redfish/v1/$metadata/index.xml
index f936591..4750602 100644
--- a/static/redfish/v1/$metadata/index.xml
+++ b/static/redfish/v1/$metadata/index.xml
@@ -2344,6 +2344,9 @@
         <edmx:Include Namespace="Thermal.v1_7_0"/>
         <edmx:Include Namespace="Thermal.v1_7_1"/>
     </edmx:Reference>
+    <edmx:Reference Uri="/redfish/v1/schema/TriggersCollection_v1.xml">
+        <edmx:Include Namespace="TriggersCollection"/>
+    </edmx:Reference>
     <edmx:Reference Uri="/redfish/v1/schema/UpdateService_v1.xml">
         <edmx:Include Namespace="UpdateService"/>
         <edmx:Include Namespace="UpdateService.v1_0_0"/>