apps/iotune: drop struct from std::vector
apps/iotune: drop struct from std::vector

scylladb/seastar,cloudius-systems/seastar,avikivity/seastar,dreamsxin/seastar,avikivity/seastar,cloudius-systems/seastar,cloudius-systems/seastar,syuu1228/seastar,syuu1228/seastar,scylladb/seastar,avikivity/seastar,scylladb/seastar,dreamsxin/seastar,dreamsxin/seastar,syuu1228/seastar