Add LXD preseed file

roles/lxd/templates/lxd_preseed.yml.j2

@@ -0,0 +1,31 @@
+config:
+  core.https_address: "[::]:8443"
+  core.trust_password: ""
+networks:
+- config:
+    ipv4.address: auto
+    ipv6.address: auto
+  description: ""
+  managed: false
+  name: lxdbr0
+  type: ""
+storage_pools:
+- config: {}
+  description: ""
+  name: default
+  driver: dir
+profiles:
+- config: {}
+  description: ""
+  devices:
+    eth0:
+      name: eth0
+      nictype: bridged
+      parent: lxdbr0
+      type: nic
+    root:
+      path: /
+      pool: default
+      type: disk
+  name: default
+cluster: null