Use the actual VS2017 RTM references

Previously the change was using references from VS2017U3 (preview).
This ended up causing some breaks because types moved around in the
assemblies.

Author: jaredpar

References/Vs2017/Microsoft.VisualStudio.CoreUtility.dll

@@ -31,15 +31,5 @@ void ILoggingServiceInternal.PostEvent(string key, IReadOnlyList<object> namesAn
         {
 
         }
-
-        void ILoggingServiceInternal.PostEvent(DataModelEventType eventType, string eventName, TelemetryResult result, params (string name, object property)[] namesAndProperties)
-        {
-
-        }
-
-        void ILoggingServiceInternal.PostEvent(DataModelEventType eventType, string eventName, TelemetryResult result, IReadOnlyList<(string name, object property)> namesAndProperties)
-        {
-
-        }
     }
 }