zuul: Add /etc/libvirt to log collection

Useful when debugging libvirtd issues such as bug #1912310.

Related-Bug: #1912310
Change-Id: Ic8504bd61316e44215672cc44436a3b9a19e114d
diff --git a/.zuul.yaml b/.zuul.yaml
index 3c490ff..b189849 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -336,6 +336,7 @@
         /var/log/postgresql: logs
         /var/log/mysql: logs
         /var/log/libvirt: logs
+        /etc/libvirt: logs
         /etc/sudoers: logs
         /etc/sudoers.d: logs
         '{{ stage_dir }}/iptables.txt': logs