Improved hostname validator to reject hostnames with a trailing dot.
Improved hostname validator to reject hostnames with a trailing dot.

d9pouces/django-powerdns-manager,d9pouces/django-powerdns-manager,kumina/django-powerdns-manager,gnotaras/django-powerdns-manager,kumina/django-powerdns-manager,gnotaras/django-powerdns-manager