Fix neutron agents resource url

Change-Id: Ie631dd71e19d6988cd91b37ae935f2c49ab55a6b
diff --git a/openstack/networking/v2/extensions/agents/urls.go b/openstack/networking/v2/extensions/agents/urls.go
index 198032b..e4fac8d 100644
--- a/openstack/networking/v2/extensions/agents/urls.go
+++ b/openstack/networking/v2/extensions/agents/urls.go
@@ -3,5 +3,5 @@
 import gophercloud "gerrit.mcp.mirantis.net/debian/gophercloud.git"
 
 func listURL(c *gophercloud.ServiceClient) string {
-	return c.ServiceURL("v2.0/agents")
+	return c.ServiceURL("agents")
 }