Consider implementing logger inheritance in IceGrid node

[bentoi]

Right now, there's no easy way for servers started by an IceGrid node to log to the same logger as the one used by the node. For example, if the node is logging to the Windows event log, you can't easily get servers started by the node to log to the event log as well.

We should consider improving this. The node could possibly attach a remote logger to each of the started servers to forward the logging to its internal logger?

ICE-6118