feat: enable use of dhcp addresses in networkd (#273)

- change ipaddress to be optional
- add dhcp option

Reviewed-on: https://git.query.consul/unkinben/puppet-prod/pulls/273

modules/networking/manifests/static.pp

@@ -1,10 +1,11 @@
 # manage static interfaces
 define networking::static (
   String                $type,
-  Stdlib::IP::Address   $ipaddress,
   Stdlib::IP::Address   $netmask  = '255.255.255.0',
   Integer[100-9200]     $mtu      = 1500,
+  Boolean               $dhcp     = false,
   Optional[Boolean]     $forwarding = false,
+  Optional[Stdlib::IP::Address]         $ipaddress = undef,
   Optional[Stdlib::IP::Address]         $gateway = undef,
   Optional[Array[Stdlib::IP::Address]]  $dns = undef,
   Optional[Array[Stdlib::Fqdn]]         $domains = undef,