[ReleasePR preview/containerservice/mgmt/2018-08-01-preview/containerservice] delete duplicated part in readme.python.md#13588

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openapi-sdkautomation[bot] wants to merge 1 commit intoAzure:masterfrom AzureSDKAutomation:sdkAuto/preview_containerservice/mgmt/2018-08-01-preview/containerservice

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