feat: pre-pull ovn-controller image

Closes-Bug: ATMOSPHERE-634
Depends-On: I0b15142aabab38fafab829a16cee0297b749e6e8
Change-Id: I2661648efde71b38be3c2ed32ef3375e8c7dae51
(cherry picked from commit bc6a06bfbb4133f6e8295ad5953bd2fe8c3d86d6)
diff --git a/playbooks/openstack.yml b/playbooks/openstack.yml
index ffd5322..abd5843 100644
--- a/playbooks/openstack.yml
+++ b/playbooks/openstack.yml
@@ -79,7 +79,7 @@
       tags:
         - iscsi
 
-- name: Deploy Open vSwitch
+- name: Deploy SDN
   hosts: controllers:computes
   become: true
   gather_facts: false
@@ -88,13 +88,13 @@
       tags:
         - openvswitch
 
-- hosts: controllers[0]
-  become: true
-  roles:
     - role: ovn
       tags:
         - ovn
 
+- hosts: controllers[0]
+  become: true
+  roles:
     - role: libvirt
       tags:
         - libvirt