Only include cluster.conf and osd.conf when building ceph.conf

This is the same fix as bc846b7da6
applied to the other part of the code-base that builds ceph.conf (I'd
missed that 349b9ab3e7 had duplicated
this code).

Signed-off-by: Matthew Vernon <mv3@sanger.ac.uk>

roles/ceph-common/tasks/generate_ceph_conf.yml

@@ -25,6 +25,7 @@
   assemble:
     src: /etc/ceph/ceph.d/
     dest: /etc/ceph/{{ cluster }}.conf
+    regexp: "^(({{cluster}})|(osd)).conf$"
     owner: "ceph"
     group: "ceph"
     mode: "0644"