Introduce Cerficate Login Document
This is an alternetive way to login using Certificates. Probably this format will evolve into use caucase; however this only introduce some most basic features.
Certificate Login is used for store login definitions, whenever a "REMOTE LOGIN" is used, the Certificate Login can be used (not requiring provide ERP5 Login with passwords to the users).
On SlapOS Master, certificate login is used for machine authentication, whenever a Computer access master via API for example (yes, Computer Document is a user).
Note: This is an extension of what exists, not a redesign towards Caucase usage (however, I think Certificate Login will be required anyway if we would like to have multiple Certificates).
Note 2: We DO NOT store the certificate on Certificate Login, since we use external authentication, we only need to assert the Remote Login into the Login reference.