Associate floating IP after lb ACTIVE

There was a chance that the `device_owner` of VIP port changed to
`compute:None` which blocks the VIP subnet clean up, this patch fixed
that.

Change-Id: I39a63584793c1f0aca7a74f01649dd5618d5829e
Story: 2006551
Task: 36634
diff --git a/octavia_tempest_plugin/tests/scenario/v2/test_traffic_ops.py b/octavia_tempest_plugin/tests/scenario/v2/test_traffic_ops.py
index eba7e38..5b6d99b 100644
--- a/octavia_tempest_plugin/tests/scenario/v2/test_traffic_ops.py
+++ b/octavia_tempest_plugin/tests/scenario/v2/test_traffic_ops.py
@@ -51,6 +51,12 @@
             cls.mem_lb_client.cleanup_loadbalancer,
             cls.lb_id)
 
+        waiters.wait_for_status(cls.mem_lb_client.show_loadbalancer,
+                                cls.lb_id, const.PROVISIONING_STATUS,
+                                const.ACTIVE,
+                                CONF.load_balancer.lb_build_interval,
+                                CONF.load_balancer.lb_build_timeout)
+
         if CONF.validation.connect_method == 'floating':
             port_id = lb[const.VIP_PORT_ID]
             result = cls.lb_mem_float_ip_client.create_floatingip(
@@ -67,12 +73,6 @@
         else:
             cls.lb_vip_address = lb[const.VIP_ADDRESS]
 
-        waiters.wait_for_status(cls.mem_lb_client.show_loadbalancer,
-                                cls.lb_id, const.PROVISIONING_STATUS,
-                                const.ACTIVE,
-                                CONF.load_balancer.lb_build_interval,
-                                CONF.load_balancer.lb_build_timeout)
-
         protocol = const.HTTP
         lb_feature_enabled = CONF.loadbalancer_feature_enabled
         if not lb_feature_enabled.l7_protocol_enabled: