Add support for options "domain-name-servers" and "domain-name" in subnets.

dhcpd/files/subnet.jinja

@@ -14,6 +14,12 @@
 {%- if config.has_key('broadcast_address') %}
 {{ intendation }}  option broadcast-address {{ config['broadcast_address'] }};
 {%- endif %}
+{%- if config.has_key('domain_name_servers') %}
+{{ intendation }}  option domain-name-servers {{ config['domain_name_servers']|join(',') }};
+{%- endif %}
+{%- if config.has_key('domain_name') %}
+{{ intendation }}  option domain-name "{{ config['domain_name'] }}";
+{%- endif %}
 {%- if config.has_key('filename') %}
 {{ intendation }}  filename "{{ config['filename'] }}";
 {%- endif %}