Specify security attributes for configuration file entries

Description of the project: In this Google Summer of Code Project we want to introduce a simple way for maintainers to specify the relevance of individual configuration options. When the specification and the default option changes during an upgrade, a tool will merge options to achieve better quality attributes such as security. The main focus will be on having a tool to validate security attributes in configuration files, e.g. inform users if options such as ?ServerKeyBits of the openssh-server configuration file are considered insecure.