unbound: fix dhclient.conf copy

The original version of this was wishful thinking: "is file" only
works locally, but this needs to run on the remote node.

Change-Id: Ib683809fdf580f41d213308331925c4765bb09d9

playbooks/roles/unbound/tasks/dhclient.yaml

@@ -0,0 +1,11 @@
+- name: Register dhclient config file
+  stat:
+    path: "{{ item }}"
+  register: _dhclient
+
+- name: Write dhclient config file
+  when: _dhclient.stat.exists | bool
+  copy:
+    src: dhclient.conf
+    dest: "{{ item }}"
+    mode: 0444

playbooks/roles/unbound/tasks/main.yaml

@@ -11,12 +11,8 @@
     state: present
     name: unbound
 
-- name: Write dhclient config file
-  copy:
-    src: dhclient.conf
-    dest: "{{ item }}"
-    mode: 0444
-  when: item is file
+- name: Write dhclient config files
+  include_tasks: dhclient.yaml
   loop:
     - /etc/dhcp/dhclient.conf
     - /etc/dhcp/dhclient-eth0.conf