Merge seastar upstream

* seastar 10e09b0...2e041c2 (7):
  > Merge "Change app_template::run() to terminate when callback is done" from Tomasz
  > resource: Fix compilation for hwloc version 1.8.0
  > memory: Fix infinite recursion when throwing std::bad_alloc
  > core/reactor: Throw the right error code when connect() fails
  > future: improve exception safety
  > xen: add missing virtual destructors
  > circular_buffer: do not destroy uninitialized object

app_template::run() users updated to call app_template::run_depracated().

main.cc

@@ -92,7 +92,7 @@ int main(int ac, char** av) {
     auto& mm = service::get_migration_manager();
     api::http_context ctx(db, proxy);
 
-    return app.run(ac, av, [&] {
+    return app.run_deprecated(ac, av, [&] {
         if (help_loggers) {
             do_help_loggers();
             engine().exit(1);