initial commit of simple ipv6 support

As soon as in warewulf.conf a value for ipaddr6 is defined
all nodes will get a derived ipv6 address if not the ipv6
is not explicitly set.

overlays/wwinit/etc/sysconfig/network-scripts/ifcfg-default.ww

@@ -1,4 +1,8 @@
-DEVICE={{$.NetDevs.default.Device}}
+# This file is autogenerated by warewulf 
+# Host:   {{.BuildHost}}
+# Time:   {{.BuildTime}}
+# Source: {{.BuildSource}}
+# DEVICE={{$.NetDevs.default.Device}}
 NAME=default
 BOOTPROTO=static
 DEVTIMEOUT=10
@@ -6,4 +10,11 @@ IPADDR={{$.NetDevs.default.Ipaddr}}
 NETMASK={{$.NetDevs.default.Netmask}}
 GATEWAY={{$.NetDevs.default.Gateway}}
 HWADDR={{$.NetDevs.default.Hwaddr}}
-ONBOOT=yes
+ONBOOT=yes
+IPV6INIT=yes
+IPV6_AUTOCONF=yes
+IPV6_DEFROUTE=yes
+IPV6_FAILURE_FATAL=no
+{{- if $.NetDevs.default.Ipaddr6 }}
+IPV6ADDR="{{ $.NetDevs.default.Ipaddr6 }}" 
+{{- end }}

overlays/wwinit/etc/wicked/ifconfig/ifcfg-default.xml.ww

@@ -1,3 +1,9 @@
+<!-- 
+This file is autogenerated by warewulf 
+Host:   {{.BuildHost}}
+Time:   {{.BuildTime}}
+Source: {{.BuildSource}}
+-->
 <interface origin="static generated warewulf config">
   <name>{{.NetDevs.default.Device}}</name>
   <control>
@@ -24,4 +30,11 @@
     <privacy>prefer-public</privacy>
     <accept-redirects>false</accept-redirects>
   </ipv6>
+{{- if $.NetDevs.default.Ipaddr6 }}
+  <ipv6:static>
+    <address>
+      <local>{{ $.NetDevs.default.Ipaddr6 }}</local>
+    </address>
+  </ipv6:static>
+{{- end }}
 </interface>