Merge seastar upstream
* seastar 401c333...3029ebe (3): > util: add a seastar::value_of() helper function > rpc: force closing listen fd on server stop > reactor: fix I/O priority class id assignment
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* seastar 401c333...3029ebe (3): > util: add a seastar::value_of() helper function > rpc: force closing listen fd on server stop > reactor: fix I/O priority class id assignment