IpvxTrafGen doesn't evaulate destAddr until message is sent

[edlongman]

In IpvxTrafGen, the destination addresses string is not evaluated until the first message is sent. https://github.com/inet-framework/inet/blob/be4e4cd2953f564cdfca8cbbaaeb476b8df795aa/src/inet/applications/generic/IpvxTrafGen.cc#L96-L106

Is there a good reason for this. I think it would make more sense to be evaluated in the initialize() "INITSTAGE_APPLICATION_LAYER" part.

Not evaluating it until the first message is sent makes the class less useful when inherited from, since this property cannot be used if it is not evaluated.

[ZoltanBojthe]

The token maybe stay unresolved in initialize, but resolved in handleMessage: for example, dinamically generated network node, IPv6 addresses, etc.

[levy]

I think we can close this issue because the current behavior is better than the one suggested.