Configuration Replace

Replaces existing configuration on module installation via using a “rewrite” folder in the config directory.

This can be handy, if you like to replace existing configuration (like admin user email address) without the need to use install or update hooks. You can just place your configuration YAML files into the config/rewrite directory in your module folder. Afterwards the existing configuration will be replaced on module installation.


Source: https://drupal.org/project/project_module/feed/all