[ReleasePR changeanalysis] fix namespace and output-folder in change …

…analysis (#1459)

Create to sync Azure/azure-rest-api-specs#12381
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/master...AzureSDKAutomation:sdkAuto/changeanalysis?expand=1)

schemas/2020-04-01-preview/Microsoft.ChangeAnalysis.json

@@ -166,4 +166,4 @@
       "description": "Top level metadata https://github.com/Azure/azure-resource-manager-rpc/blob/master/v1.0/common-api-contracts.md#system-metadata-for-all-azure-resources"
     }
   }
-}
+}