Merge seastar upstream
* seastar 864d6dc...401c333 (8): > scollectd: Support filtering specific collectd metrics > core: Integrate error reporting with the logging framework > rpc: wait for all replies to be completed before closing rpc server > rpc: clean up resource accounting > queue: fix race between pop_eventually() and abort() > rpc_test: fix cancel test to not depend on timing. > tutorial: explain application-specific command line options > add ostream output operator for std::unordered_map
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