apparmor, libvirt-qemu: Allow access to certificates used by libvirt-vnc

When setting up VncTLS according to the official Libvirt documentation,
only one certificate for libvirt/libvirt-vnc is used. The document
indicates to use the following directories :

 /etc/pki/CA
 /etc/pki/libvirt
 /etc/pki/libvirt/private

in order to manage the certificates used by libvirt-vnc.

Bug-Ubuntu: https://bugs.launchpad.net/bugs/901272Signed-off-by: NChristian Ehrhardt <christian.ehrhardt@canonical.com>
Signed-off-by: NStefan Bader <stefan.bader@canonical.com>

examples/apparmor/libvirt-qemu

@@ -142,6 +142,12 @@
   /usr/{lib,lib64}/qemu/block-curl.so mr,
   /usr/{lib,lib64}/qemu/block-rbd.so mr,
 
+  # for use by libvirt-vnc (LP: #901272)
+  /etc/pki/CA/ r,
+  /etc/pki/CA/* r,
+  /etc/pki/libvirt/ r,
+  /etc/pki/libvirt/** r,
+
   # for save and resume
   /{usr/,}bin/dash rmix,
   /{usr/,}bin/dd rmix,