Merge seastar upstream
* seastar 1b3b801...7a8b261 (2): > future: assert if promise is inadvertently reused after _state is already destroyed > build: don't build dpdk kni modules
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* seastar 1b3b801...7a8b261 (2): > future: assert if promise is inadvertently reused after _state is already destroyed > build: don't build dpdk kni modules