Bring partially https://github.com/gophercloud/gophercloud/pull/1221

Change-Id: I185e1991b68a22b387d043bc32bef79cd4c3dc4e
Related-To: PRODX-8893
diff --git a/openstack/orchestration/v1/stacks/template_test.go b/openstack/orchestration/v1/stacks/template_test.go
index 72368c3..2e94d25 100644
--- a/openstack/orchestration/v1/stacks/template_test.go
+++ b/openstack/orchestration/v1/stacks/template_test.go
@@ -99,7 +99,7 @@
       - {uuid: 11111111-1111-1111-1111-111111111111}`
 	th.Mux.HandleFunc(urlparsed.Path, func(w http.ResponseWriter, r *http.Request) {
 		th.TestMethod(t, r, "GET")
-		w.Header().Set("Content-Type", "application/jason")
+		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusOK)
 		fmt.Fprintf(w, myNovaContent)
 	})