Add option "lock-config" for shell command "config:set" #13280

 - fixed backward compatibility

Author: Oleksii Korshenko

app/code/Magento/Config/Console/Command/ConfigSet/ConfigSetProcessorFactory.php

@@ -27,6 +27,12 @@ class ConfigSetProcessorFactory
      * lock - save and lock configuration
      */
     const TYPE_DEFAULT = 'default';
+    
+    /**
+     * @deprecated
+     * @see TYPE_LOCK_ENV or TYPE_LOCK_CONFIG
+     */
+    const TYPE_LOCK = 'lock';
     const TYPE_LOCK_ENV = 'lock-env';
     const TYPE_LOCK_CONFIG = 'lock-config';
     /**#@-*/