Change listener type from string to listener

Change-Id: Ibef19a99df51cee9f6416ffb236171a2ccd290cf
diff --git a/openstack/networking/v2/extensions/lbaas_v2/loadbalancers/results.go b/openstack/networking/v2/extensions/lbaas_v2/loadbalancers/results.go
index cd68055..f607546 100644
--- a/openstack/networking/v2/extensions/lbaas_v2/loadbalancers/results.go
+++ b/openstack/networking/v2/extensions/lbaas_v2/loadbalancers/results.go
@@ -2,6 +2,7 @@
 
 import (
 	"gerrit.mcp.mirantis.net/debian/gophercloud.git"
+	"gerrit.mcp.mirantis.net/debian/gophercloud.git/openstack/networking/v2/extensions/lbaas_v2/listeners"
 	"gerrit.mcp.mirantis.net/debian/gophercloud.git/pagination"
 )
 
@@ -32,8 +33,9 @@
 	// The UUID of a flavor if set.
 	Flavor string `json:"flavor"`
 	// The name of the provider.
-	Provider  string   `json:"provider"`
-	Listeners []string `json:"listeners"`
+	Provider string `json:"provider"`
+	// Listeners are the listeners related to this Loadbalancer.
+	Listeners []listeners.Listener `json:"listeners"`
 }
 
 type StatusTree struct {