With network parameters the CN is no longer needed to identify notaries. This frees it up to be used in the node's name alongside the other attributes.
Also, the identity generation logic has been simplified, removing the need to have magic string values for storing distributed identities in the keystore. Now there are just two alias prefixes: "identity" as it was previously, and "distributed-notary".
* Redo legal name validation rules so that direction change chars are rejected
* Split name validation into minimal rules that all nodes can require, plus extended rules that the Doorman will apply (and we may need to change, without updating the entire network).
* Break down name validation rule sets to better match expectations
* Add test for nulls in Corda names
