- decouple config and messages
- cainfo maps from config.Profile to messages.CAProfile
- config parses profile usage
- validity can be configured per certificate profile, defaults are defined in
a defaultValidity method of the profile usage
- the client simulator emits certificate signing requests at random intervals
- add implementation of SingCertificateCommand to MsgPackHandler
- remove indirection signing.RequestSignature
- allow multiple attempts to setup certificates
- use CAB forum BR compliant CRLDistributionPoint for Subordinate CA
certificates by referencing their own CRL instead of their parent CA's CRL
- store certificates in DER encoded form
