Intermittent test failure: com.github.ambry.router.CloudRouterTest » testRouterBasic[1]

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This failed once for me on travis CI and succeeded on the following attempt:
```
com.github.ambry.router.RouterException: Server returned: Blob_Expired. Chunk ID: AAYQAgfuY7wAAQAAAAAAAAAHLlADt2RqSkmfDIZM8yc6KQ Error: BlobExpired
java.util.concurrent.ExecutionException: com.github.ambry.router.RouterException: Server returned: Blob_Expired. Chunk ID: AAYQAgfuY7wAAQAAAAAAAAAHLlADt2RqSkmfDIZM8yc6KQ Error: BlobExpiredOpen stacktrace
Caused by: com.github.ambry.router.RouterException: Server returned: Blob_Expired. Chunk ID: AAYQAgfuY7wAAQAAAAAAAAAHLlADt2RqSkmfDIZM8yc6KQ Error: BlobExpiredClose stacktrace
at com.github.ambry.router.GetBlobOperation$GetChunk.buildChunkException(GetBlobOperation.java:1068)
at com.github.ambry.router.GetBlobOperation$GetChunk.processGetBlobResponse(GetBlobOperation.java:937)
at com.github.ambry.router.GetBlobOperation$GetChunk.handleResponse(GetBlobOperation.java:828)
at com.github.ambry.router.GetBlobOperation.handleResponse(GetBlobOperation.java:247)
at com.github.ambry.router.GetManager.handleResponse(GetManager.java:226)
at com.github.ambry.router.NonBlockingRouter$OperationController.onResponse(NonBlockingRouter.java:856)
at com.github.ambry.router.NonBlockingRouter$OperationController.run(NonBlockingRouter.java:894)
at java.lang.Thread.run(Thread.java:748)
```

Build scan link: https://scans.gradle.com/s/gfipjv2jcdigm/tests/vw7cjzzt7rohe-s5avd6yx7dauy?open-stacktraces=WzFd

Start with CloudRouterTest.testRouterBasic[1] and the failure stack trace in GetBlobOperation.java, then trace the response handling through GetManager and NonBlockingRouter. Reproduce the intermittent BlobExpired failure and determine the test or router behavior that needs correction; done means the test is reliable and passes consistently.

Written by the indexing model from the issue text.