timing issue on fetching results from S3

[muratiakos]

For some executions the uploaded results are not available for S3 read immediately and the cmdlet returns:

System.InvalidOperationException: The specified key does not exist. ---> Amazon.S3.AmazonS3Exception: The specified key does not exist. ---> Amazo
n.Runtime.Internal.HttpErrorResponseException: The remote server returned an error: (404) Not Found. ---> System.Net.WebException: The remote server return
ed an error: (404) Not Found.
   at System.Net.HttpWebRequest.GetResponse()
   at Amazon.Runtime.Internal.HttpRequest.GetResponse()
   --- End of inner exception stack trace ---
   at Amazon.Runtime.Internal.HttpRequest.GetResponse()
   at Amazon.Runtime.Internal.HttpHandler`1.InvokeSync(IExecutionContext executionContext)
   at Amazon.Runtime.Internal.RedirectHandler.InvokeSync(IExecutionContext executionContext)
   at Amazon.Runtime.Internal.Unmarshaller.InvokeSync(IExecutionContext executionContext)
   at Amazon.S3.Internal.AmazonS3ResponseHandler.InvokeSync(IExecutionContext executionContext)
   at Amazon.Runtime.Internal.ErrorHandler.InvokeSync(IExecutionContext executionContext)
   --- End of inner exception stack trace ---
   at Amazon.PowerShell.Utils.ProgressRunner.Run(Action action, ProgressTracker tracker)
   at Amazon.PowerShell.Utils.ProgressRunner.SafeRun(Action action, ProgressTracker tracker)
   --- End of inner exception stack trace ---
   at System.Management.Automation.MshCommandRuntime.ThrowTerminatingError(ErrorRecord errorRecord)

Probably in these cases we need to add an extra wait to let enough time for S3 to make the results available for read after the uploads.