* docs: input format for default_critical_options and default_extensions * s/sshca/ssh * Added default_critical_options and default_extensions to the read endpoint of role * Change default time return value to 0
Major changes are: * Remove duplicate code * Check the public key used to configure the backend is a valid one
Major changes are: * Change `allow_{user,host}_certificates` to default to false * Add separate `allowed_domains` role property
