- implement domains.forms.relative_domain_validator
- use the validator for domain field validation in
domains.forms.CreateHostingDomainForm
- use the validator for subdomain field validation in
websites.forms.AddWebsiteForm
- implement domains.forms.CreateHostingDomainForm
- implement domains.models.HostingDomainManager.create_for_hosting_package that
takes care of creating the necessary database objects for hosting domains
assigned to a hosting package