Create artifacts dir regardless of afs rpm builds

We don't always create afs rpms in our periodic job so we were skipping
the creation of the artifacts dir. Unfortunately the openstack
artifact publishing playbook expects this dir to exist. Fix this by
creating the artifacts dir but not populating it with RPMs if we didn't
build any RPMs for openafs.

Change-Id: I986bca765ae898e9792e789c6852bce1d654d580

playbooks/package-afs-centos/post.yaml

@@ -1,6 +1,14 @@
 - hosts: all
   tasks:
 
+    # Note we always create the artifacts dir so that the openstack artifacts
+    # publishing playbook is happy.
+    - name: Ensure artifacts directory exists
+      file:
+        state: directory
+        path: '{{ zuul.executor.work_root }}/artifacts/package-afs-centos7'
+      delegate_to: localhost
+
     # We only build an RPM if one doesn't exist for the desired version.
     - name: Check for built RPMs
       stat:
@@ -10,13 +18,6 @@
         get_md5: false
       register: rpms_exist
 
-    - name: Ensure artifacts directory exists
-      when: rpms_exist.stat.exists
-      file:
-        state: directory
-        path: '{{ zuul.executor.work_root }}/artifacts/package-afs-centos7'
-      delegate_to: localhost
-
     - name: Copy RPMs back for publication
       when: rpms_exist.stat.exists
       synchronize: