playbooks/automount: All playbooks should use .yml

The playbooks automount-map-absent.yaml and automount-map-present.yaml
have been using the wrong extention. The files have been renamed to use
.yml now.

playbooks/automount/automount-map-absent.yml

@@ -0,0 +1,12 @@
+---
+- name: Automount map absent example
+  hosts: ipaserver
+  become: no
+
+  tasks:
+  - name: ensure map TestMap is absent
+    ipaautomountmap:
+      ipaadmin_password: SomeADMINpassword
+      name: TestMap
+      location: TestLocation
+      state: absent