Restart libvirtd after firewalld.service restart

Starting libvirtd.service provides iptable rules for NATed network virbr0.
When starting firewalld.service after libvirtd, these rules will be
overwritten. So NAT will no longer work. Restart of libvirtd fixes the
rules again.

roles/lmn_fvs/files/pam-exec.sh

@@ -5,6 +5,12 @@
 
 if [[ "${PAM_USER}" =~ -exam$ ]]; then
   systemctl start firewalld.service
+  if systemctl is-enabled --quiet libvirtd.service; then
+    systemctl restart libvirtd.service
+  fi
 elif ! (users | grep -q -- "-exam"); then
   systemctl stop firewalld.service
+  if systemctl is-enabled --quiet libvirtd.service; then
+    systemctl restart libvirtd.service
+  fi
 fi