SCB-305 postInterceptor should throw the exception when the timeout happens

[zhfeng]

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https://issues.apache.org/jira/browse/SCB-305

[coveralls]

Coverage decreased (-0.2%) to 95.353% when pulling a3fe071 on zhfeng:SCB-305 into 506a10e on apache:master.

[zhfeng]

@WillemJiang @seanyinx can you review these change and merge it with helping the timeout scenario.
Thanks !