Fix nova service ID type

Change-Id: Ic726de7cb537dcc76aab2ec7f4382c4e97a8abb5
diff --git a/openstack/compute/v2/extensions/os-services/results.go b/openstack/compute/v2/extensions/os-services/results.go
index 3c6bb04..4a8975a 100644
--- a/openstack/compute/v2/extensions/os-services/results.go
+++ b/openstack/compute/v2/extensions/os-services/results.go
@@ -3,7 +3,7 @@
 import "gerrit.mcp.mirantis.net/debian/gophercloud.git/pagination"
 
 type OsService struct {
-	ID     string `json:"id"`
+	ID     int    `json:"id"`
 	Host   string `json:"host"`
 	State  string `json:"state"`
 	Status string `json:"status"`