Merge seastar upstream
* seastar 2eec212...194d80f (4): > removing the collectd tests > fix fstream metrics reporting. > do_for_each: Make it check for need preempt > core/sharded: introduce copy method to foreign_ptr
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* seastar 2eec212...194d80f (4): > removing the collectd tests > fix fstream metrics reporting. > do_for_each: Make it check for need preempt > core/sharded: introduce copy method to foreign_ptr