test(19.3-05): Journal site-cache keys: framework keys win, alias keys deprecated

- site_cache_keys_test.go: wireSiteCache on a config without a database
- rename the Docker admin test to TestCategoriesAdminFrameworkKeysWin so the
  unit test owns TestSiteCacheFrameworkKeysWin (one name per test binary)

site_cache_admin_test.go

@@ -330,10 +330,10 @@ func TestPostsAdminPurgesSiteCache(t *testing.T) {
 	})
 }
 
-// TestSiteCacheFrameworkKeysWin proves the framework keys site_cache.* take
+// TestCategoriesAdminFrameworkKeysWin proves the framework keys site_cache.* take
 // precedence over the Journal's deprecated keys: with both set, a category
 // save purges through the framework target only.
-func TestSiteCacheFrameworkKeysWin(t *testing.T) {
+func TestCategoriesAdminFrameworkKeysWin(t *testing.T) {
 	framework := newPurgeReceiver(t)
 	alias := newPurgeReceiver(t)
 	env := newPostsEnv(t, append(alias.env(),