Removed Warning, Notify and Fatal:
* `Warning` => `Error` or `Info`
* `Notify` => `Info`
* `Fatal` was never used.
Note that --log-level=warning is still supported for backwards
compatibility, but it is the same as --log-level=error.
Co-authored-by: Julio López <julio+gh@kasten.io>
* user: validate that usernames in repository are all-lowercase and user@hostname-without-domain
* user: relaxed validation to allow -, _ and . in username and hostname
* user: added user profile (username&password for authentication) and CRUD methods
* manifest: helpers for disambiguating manifest entries
* authn: added repository-based user authenticator
* cli: added commands to manipulate user accounts and passwords
* cli: added --allow-repository-users option to 'server start'
* Update cli/command_user_info.go
Co-authored-by: Julio López <julio+gh@kasten.io>
* Always return false when the user is not found.
