Replace with_first_found with lookup first_found

The with_ directives are discouraged now in place of use of loop: and/or
lookup filters. In the case of with_first_found, it confuses people
because with_ directives are usually a loop, but in this case it's
the task is always executed once. Using the first_found filter makes it
clearer that this is occuring.

While we're in there, remove uses of 'static: no'. Since 2.0 includes
are dynamic by default, so these are not necessary.

Change-Id: Ie429d7614b2f3322a646f46a8117d4b6ae29f737

playbooks/roles/base-server/tasks/main.yaml

@@ -5,8 +5,9 @@
   loop: '{{ base_packages }}'
 
 - name: Include OS-specific variables
-  include_vars: "{{ item }}"
-  with_first_found:
+  include_vars: "{{ lookup('first_found', file_list) }}"
+  vars:
+    file_list:
       - "{{ ansible_facts.distribution }}.{{ ansible_facts.architecture }}.yaml"
       - "{{ ansible_facts.distribution }}.yaml"
       - "{{ ansible_facts.os_family }}.yaml"
@@ -54,7 +55,6 @@
 
 - name: Include OS-specific tasks
   include_tasks: "{{ lookup('first_found', file_list) }}"
-  static: no
   vars:
     file_list:
       - "{{ ansible_facts.distribution }}.{{ ansible_facts.lsb.codename }}.{{ ansible_facts.architecture }}.yaml"

playbooks/roles/exim/tasks/main.yaml

@@ -1,16 +1,17 @@
 - name: Include OS-specific variables
-  include_vars: "{{ item }}"
-  with_first_found:
+  include_vars: "{{ lookup('first_found', file_list) }}"
+  vars:
+    file_list:
       - "{{ ansible_facts.distribution }}.{{ ansible_facts.architecture }}.yaml"
       - "{{ ansible_facts.distribution }}.yaml"
       - "{{ ansible_facts.os_family }}.yaml"
       - "default.yaml"
 
 - name: Include OS-specific tasks
-  include_tasks: "{{ item }}"
-  static: no
-  with_first_found:
-    - files:
+  include_tasks: "{{ lookup('first_found', params) }}"
+  vars:
+    params:
+      files:
         - "{{ ansible_facts.distribution }}.{{ ansible_facts.lsb.codename }}.{{ ansible_facts.architecture }}.yaml"
         - "{{ ansible_facts.distribution }}.{{ ansible_facts.architecture }}.yaml"
         - "{{ ansible_facts.distribution }}.yaml"