add back python-guestfs

This is needed otherwise we fall back to the nbd code path which is
super hacky. This shouldn't have been deleted for the venv path.

Change-Id: If5cb6cb4944bd0ed3548d53c98443b76725d1c0c
diff --git a/lib/nova_plugins/functions-libvirt b/lib/nova_plugins/functions-libvirt
index 60707cf..edcf73e 100644
--- a/lib/nova_plugins/functions-libvirt
+++ b/lib/nova_plugins/functions-libvirt
@@ -24,13 +24,13 @@
         install_package libvirt-bin libvirt-dev
         pip_install libvirt-python
         install_package libguestfs0
-        #install_package python-guestfs
+        install_package python-guestfs
         #pip_install <there-si-no-guestfs-in-pypi>
     elif is_fedora || is_suse; then
         install_package kvm
         install_package libvirt libvirt-devel
         pip_install libvirt-python
-        #install_package python-libguestfs
+        install_package python-libguestfs
     fi
 
     # Restart firewalld after install of libvirt to avoid a problem