tests: Fix flaky "ovn-controller incremental processing".

Signed-off-by: Xavier Simonart <xsimonar@redhat.com>
Acked-by: Ales Musil <amusil@redhat.com>
Signed-off-by: Dumitru Ceara <dceara@redhat.com>

tests/ovn-performance.at

@@ -238,6 +238,9 @@ for i in `seq 1 5`; do
     as hv$i
     ovs-vsctl add-br br-phys
     ovn_attach n1 br-phys 192.168.0.$i
+    # Do not postpone patch ports related changes, as they may occur more or less anywere within the test,
+    # hence causing unexpected recomputes.
+    check ovn-appctl -t ovn-controller debug/ignore-startup-delay
     if [[ $i -ge 3 ]] ; then
         ovs-vsctl add-br br-ex
         ovs-vsctl set open . external_ids:ovn-bridge-mappings="public:br-ex"