Create Routing Node

[GregUtas]

Create a separate Routing Node (rn directory) that is queried to determine the Service Node to which a CIP IAM should be sent. See "Networking".

This should be the first phase in distributing the POTS application. It could be implemented in the following stages:

1. Send an internal query (within the same executable) from the POTS call to a new Factory.
2. Send the query to a separate executable (the Routing Node), using the looparound address and a pair of well-known ports.
3. Distribute directory numbers to the Routing Node (the first use case for #41).
4. Use the Routing Node's IP address instead of the looparound address (the first use case for #40).
5. Run two Routing Nodes in a load-sharing configuration (another use case for #40 and #41).