Host metadata broadcast_rpc_port is None

[dkropachev]

By some reason host metadata has broadcast_rpc_port in None, while it is expected to be 9042 Here is list of tests that are failing due to this:

• test_control_connection_port_discovery
• test_single_interface
• test_host_addresses

[fruch]

at least for one of those test_single_interface, I can say it can't even build a cluster

                # Since scylla CCM doesn't yet support this options, we skip it
                # , use_single_interface=use_single_interface)
                CCM_CLUSTER.populate(nodes, ipformat=ipformat)