Rename tmpfiles.d files

On CentOS /run/lock is created by /usr/lib/tmpfiles.d/legacy.conf file
which can be run after other conf we create for opentack services.
This patch rename the service files to openstack-service.conf to ensure
it is ran after legacy.conf

Change-Id: I2de6d437d6f6aae126deb9e619cd744dfb91eaad

tasks/ceilometer_init_systemd.yml

@@ -37,10 +37,22 @@
     - group
   when: inventory_hostname in groups[item.1]
 
+# TODO(mgariepy):
+# Remove this in Pike as it only needed to handle upgrades
+# from Newton->Newton and Newton->Ocata
+- name: Cleanup old tmpfiles.d entry
+  file:
+    path: "{{ item.0.service_name }}.conf"
+    state: absent
+  with_subelements:
+    - "{{ ceilometer_services }}"
+    - group
+  when: inventory_hostname in groups[item.1]
+
 - name: Create tmpfiles.d entry
   template:
     src: "ceilometer-systemd-tmpfiles.j2"
-    dest: "/etc/tmpfiles.d/{{ item.0.service_name }}.conf"
+    dest: "/etc/tmpfiles.d/openstack-{{ item.0.service_name }}.conf"
     mode: "0644"
     owner: "root"
     group: "root"