utils: Add get_broadcast_rpc_address and set_broadcast_rpc_address helper
utils: Add get_broadcast_rpc_address and set_broadcast_rpc_address helper

scylladb/scylla,kjniemi/scylla,duarten/scylla,raphaelsc/scylla,duarten/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,kjniemi/scylla,duarten/scylla,raphaelsc/scylla,avikivity/scylla,raphaelsc/scylla,scylladb/scylla,kjniemi/scylla