Fix warning log message

Change the way the exception is logged.

Author: douggish

src/Configuration/src/ConfigServerBase/ConfigServerConfigurationProvider.cs

@@ -188,7 +188,7 @@ private void DoPolledLoad()
         }
         catch (Exception e)
         {
-            _logger.LogWarning("Could not reload configuration during polling" + e);
+            _logger.LogWarning(e, "Could not reload configuration during polling");
         }
     }