Allow specifying network for multicast output
For multi-homed machines, it is necessary to specify the interface used for multicast communication, as the default is not necessarily correct in all cases. To ease configuration, the multicast output parameter has been updated so that the output interface is chosen by matching the provided address to the subnets configured on the interface. (i.e. parameter value of 10.226.9.0 would select interface eno2 with configured ip 10.226.9.16/255.255.255.0).