Relax minimum subject RDN attributes and add parsing for UID attribute.

[r-nolasco]

Can we reduce the requirements for the minimum relative distinguished names to remove ST?
Here are a couple examples of others having issues with it as well.

• Relax minimum subject DN field values for trustedIdentities to not include state/province (S/ST) #293
• Support x509 subject with RDN state/province using short name "S" #287

Wouldn't setting requirements in the trust policy be sufficient?

Would it be possible to add parsing of the UID attribute as well.
The parser it is using does not expect UID (0.9.2342.19200300.100.1.1) so it is dumping it out in raw form which notation can't handle and errors out with notation does not support x509.subject identities containing "=#".