* new provisioner tokens always contain the crt.Subject.CommonName
in the SANS attribute of the token claims. added tests that verifies
backwards compatibility still works in cases where the token does not
contain the subject as a SAN claim.
* authorize returns []interface{}
- operators in this list can conform to any interface the user decides
- our implementation has a combination of certificate claim validators
and certificate template modifiers.
* provisioners can set and enforce tls cert options
