Add counterparty connection id to controller port-id

[seantking]

Summary

As defined in the specification the controller side port-id is made up of ics27-1-{connection-number}-{counterparty-connection-number}-{owner-address}

At present, the generatePortId function only builds a portID with the source connection number.

Proposal

Update the generatePortId function to build a portID based on both the source + counterparty connection ids.

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