scripts: posix_net_conf.sh: Use a generic logic for RPS configuring
scripts: posix_net_conf.sh: Use a generic logic for RPS configuring

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

avikivity/seastar,avikivity/seastar,scylladb/scylla-seastar,sjperkins/seastar,dreamsxin/seastar,kjniemi/seastar,sjperkins/seastar,avikivity/seastar,scylladb/seastar,scylladb/scylla-seastar,dreamsxin/seastar,cloudius-systems/seastar,kjniemi/seastar,cloudius-systems/seastar,kjniemi/seastar,syuu1228/seastar,cloudius-systems/seastar,sjperkins/seastar,scylladb/scylla-seastar,scylladb/seastar,scylladb/seastar,syuu1228/seastar,syuu1228/seastar,dreamsxin/seastar