Require CAs to operate in accordance with their CPs and CPSes

[gerv]

Mozilla policy requires that certificates issued in contravention of a CA's CP/CPS should be revoked. Other than that, Mozilla policy does not directly require that a CA operate in accordance with its CP and CPS. We require this indirectly because the audits that we require, require it. This perhaps surprising omission was brought to light by the Let's Encrypt blocklist incident. Discussion:
https://groups.google.com/forum/#!topic/mozilla.dev.security.policy/_pSjsrZrTWY

The proposal is to have Mozilla policy directly require that CAs operate in accordance with the appropriate CP/CPS for the root(s) in our store on an ongoing basis.