rpc: add timeout feature negotiation test
rpc: add timeout feature negotiation test

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