Retry http errors

In all SDKs, there is retry logic to retry 'retryable' error codes. You can find this code [here](https://github.com/Azure/azure-sdk-for-net/blob/master/sdk/mgmtcommon/ClientRuntime/ClientRuntime/TransientFaultHandling/HttpStatusCodeErrorDetectionStrategy.cs#L26) in the .Net SDK runtime. Generally the code decides whether an error is retryable based on the response status code (most 5xx and a xsmall number of 4xx errors [429] are retryable in Azure), and the client uses an exponential backoff algorithm and a retry maximum to determine when and how many retries occur for a given request.

We need to provide this level of retries as a minimum bar. This could be provided in the default Http pipeline provided by the generated code, or in the pipeline provided by the `Register-AzModule` call.