add default hostname option

templates/etc/dhcp/macros.j2

@@ -147,6 +147,7 @@ host {{ host.hostname }}-hw{{ loop.index }} {
 {% if not host.options is defined or (host.options and not 'host-name' in host.options) %}
         option host-name "{{ host.hostname }}";
 {% endif %}
+        ddns-hostname "{{ host.hostname }}";
 {% if host.address is defined and host.address %}
         fixed-address {{ host.address }};
 {% endif %}
@@ -160,6 +161,10 @@ host {{ host.hostname }} {
 {% if host.ethernet is defined and host.ethernet %}
         hardware ethernet {{ host.ethernet }};
 {% endif %}
+{% if not host.options is defined or (host.options and not 'host-name' in host.options) %}
+        option host-name "{{ host.hostname }}";
+{% endif %}
+        ddns-hostname "{{ host.hostname }}";
 {% if host.address is defined and host.address %}
 {% if dhcpd_ipversion is defined and dhcpd_ipversion == '6' %}
         fixed-address6 {{ host.address }};