Make change-admin-password acceptence test autonomous

Up to this commit, 09-change-admin-password.go required human
intervention to run.
diff --git a/acceptance/04-create-server.go b/acceptance/04-create-server.go
index 9377b75..06c541b 100644
--- a/acceptance/04-create-server.go
+++ b/acceptance/04-create-server.go
@@ -46,7 +46,7 @@
 		panic(err)
 	}
 
-	err = createServer(servers, *imageRef, *flavorRef, *serverName, *adminPass)
+	_, err = createServer(servers, *imageRef, *flavorRef, *serverName, *adminPass)
 	if err != nil {
 		panic(err)
 	}