config adherence to YANG schema

[liambrady]

There is currently a disconnect between the defined YANG schema the actual munet config.

For example, valid topologies can be constructed that share the same connection to another node (i.e. disambiguated via the remote-name), however, this is technically breaks the YANG schema which defines to to be a unique key. (note: there are also unconnected interface which have no to config).

Explicitly changing the key to a guaranteed unique value, name, runs up against munet's capability to auto-assign names or addresses without explicit assignment, so in either way, a disconnect between the schema and config is present.