Add backoff coefficient

Author: 3vilhamster

src/main/java/com/uber/cadence/internal/replay/ReplayDecider.java

@@ -685,6 +685,7 @@ public HistoryEvent next() {
                   .setExpiration(decisionTaskRemainingTime)
                   .setInitialInterval(retryServiceOperationInitialInterval)
                   .setMaximumInterval(retryServiceOperationMaxInterval)
+                  .setBackoffCoefficient(2)
                   .build();
 
           GetWorkflowExecutionHistoryRequest request = new GetWorkflowExecutionHistoryRequest();