DHCP template generates as much of the subnet and range definition as possible.

- Closes: #1469

This makes it possible to disable just the dynamic range without losing access
to the next-server required by static host entries.

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

overlays/host/rootfs/etc/dhcp/dhcpd.conf.ww

@@ -46,11 +46,15 @@ if exists user-class and option user-class = "iPXE" {
 }
 {{- end }}
 
-{{- if and .Network .Netmask .Dhcp.RangeStart .Dhcp.RangeEnd }}
+{{- if and .Network .Netmask }}
 subnet {{.Network}} netmask {{.Netmask}} {
     max-lease-time 120;
+{{- if and .Dhcp.RangeStart .Dhcp.RangeEnd }}
     range {{.Dhcp.RangeStart}} {{.Dhcp.RangeEnd}};
+{{- end }}
+{{- if .Ipaddr }}
     next-server {{.Ipaddr}};
+{{- end }}
 }
 {{- end }}