scripts: perftune.py: distribute IRQs handling Rx separately
scripts: perftune.py: distribute IRQs handling Rx separately

Make sure that IRQs that handle Rx are equally distributed among CPUs that handle IRQ work.

Signed-off-by: Vlad Zolotarov <976c0f8d0852ed6439ad273880b400a75a7c41d0@scylladb.com>

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