io_queue: Wrap internal:: code into block
io_queue: Wrap internal:: code into block

To make lines shorter. While at it -- merge all such blocks together.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

syuu1228/seastar,scylladb/seastar,scylladb/seastar,syuu1228/seastar,syuu1228/seastar,avikivity/seastar,avikivity/seastar,scylladb/seastar,avikivity/seastar