rpc: not stop client in error state
rpc: not stop client in error state

Client in error state are already closed on in process to be closed.

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