Fixes#3521
The function NewNetAddressStringWithOptionalID is from a time when peer
IDs were optional. They're not anymore. So this should be renamed to
NewNetAddressString and should ensure the ID is provided.
* update changelog
* use NewNetAddress in transport tests
* use NewNetAddress in TestTransportMultiplexAcceptMultiple
* Switch nodeID to be tmhash.Size, add test names for net addr tests
Both of these came up when locally trying to change tmhash size.
* fix error introduced by merge
