Remove warnings about test_chttpd_auth_lockout_warning

```
    warning: function test_chttpd_auth_lockout_warning/0 is unused
    │
 48 │   defp test_chttpd_auth_lockout_warning do
    │        ~
    │
    └─ test/elixir/test/auth_lockout_test.exs:48:8: AuthLockoutTest (module)
```

Author: jiahuili430

test/elixir/test/auth_lockout_test.exs

@@ -20,45 +20,51 @@ defmodule AuthLockoutTest do
       }
     ]
 
-    run_on_modified_server(
-      server_config,
-      fn -> test_chttpd_auth_lockout_enforcement() end
-    )
+    run_on_modified_server(server_config, &test_chttpd_auth_lockout_enforcement/0)
+  end
+
+  test "do not lockout after multiple failed authentications", _context do
+    server_config = [
+      %{
+        :section => "chttpd_auth_lockout",
+        :key => "mode",
+        :value => "warn"
+      }
+    ]
+
+    run_on_modified_server(server_config, &test_chttpd_auth_lockout_warning/0)
   end
 
   defp test_chttpd_auth_lockout_enforcement do
     # exceed the lockout threshold
     for _n <- 1..5 do
       resp = Couch.get("/_all_dbs",
         no_auth: true,
-        headers:  [authorization: "Basic #{:base64.encode("chttpd_auth_lockout:baz")}"]
-        )
+        headers: [authorization: "Basic #{:base64.encode("chttpd_auth_lockout:baz")}"]
+      )
+
       assert resp.status_code == 401
     end
 
     # locked out?
     resp = Couch.get("/_all_dbs",
       no_auth: true,
-      headers:  [authorization: "Basic #{:base64.encode("chttpd_auth_lockout:baz")}"]
+      headers: [authorization: "Basic #{:base64.encode("chttpd_auth_lockout:baz")}"]
     )
+
     assert resp.status_code == 403
     assert resp.body["reason"] == "Account is temporarily locked due to multiple authentication failures"
   end
 
   defp test_chttpd_auth_lockout_warning do
     # exceed the lockout threshold
-    for _n <- 1..5 do
+    for _n <- 1..6 do
       resp = Couch.get("/_all_dbs",
         no_auth: true,
-        headers:  [authorization: "Basic #{:base64.encode("chttpd_auth_lockout:baz")}"]
-        )
+        headers: [authorization: "Basic #{:base64.encode("chttpd_auth_lockout:baz")}"]
+      )
+
       assert resp.status_code == 401
     end
-
-    # warning?
-    _resp = Couch.get("/_all_dbs",
-      no_auth: true,
-      headers:  [authorization: "Basic #{:base64.encode("chttpd_auth_lockout:baz")}"]
-    )
   end
 end