dns/ddclient: Fix default permissions of config files and update pkg-message
- Change the default permissions of the configuration files to avoid a warning at the first start.
- Also update the instructions in pkg-message because since r433788 users no longer need to create a copy of the configuration file after installation.
While I'm here:
- Fix the license and add the location to the license file
PR: 237651
Submitted by: Samy Mahmoudi <samy.mahmoudi@gmail.com>
Approved by: maintainer