apparmor, libvirt-qemu: Allow access to ceph config

Signed-off-by: NChristian Ehrhardt <christian.ehrhardt@canonical.com>
Signed-off-by: NStefan Bader <stefan.bader@canonical.com>

examples/apparmor/libvirt-qemu

@@ -156,6 +156,9 @@
   /sys/bus/ r,
   /sys/class/ r,
 
+  # for rbd
+  /etc/ceph/ceph.conf r,
+
   # for ppc device-tree access
   @{PROC}/device-tree/ r,
   @{PROC}/device-tree/** r,