[queens] Smooth out OVN backend

* add missing ovn control options file
* install networking_ovn package before db_sync
* set sync mode of ovn northbound OVSDB with neutron DB
* enable distributed floating IP support if DVR is turned on

Change-Id: I1ece368e8d763fa7c96b1853646e90d5c1fb11e0
diff --git a/tests/pillar/control_ovn.sls b/tests/pillar/control_ovn.sls
index a173679..9d4794b 100644
--- a/tests/pillar/control_ovn.sls
+++ b/tests/pillar/control_ovn.sls
@@ -12,6 +12,9 @@
         ovn:
           driver: ovn
       tenant_network_types: "geneve,flat"
+      ovn:
+        ovn_l3_scheduler: chance
+        neutron_sync_mode: off
     controller_vip: 172.16.10.101
     dvr: false
     l3_ha: false