Drop default AdminAuth

This reverts commit e4d1e7de10.
Sry, I was on the wrong branch.

Support include and require_in pillar options.

Allow the user to add extra server config

Fix typo in template 01proxy

The key is always null and thus localhost is always used no matter
way. This correction lets users specify the apt-cacher host.

Change states to use short-dec style

Use makedirs for server_cache_dir and server_log_dir

Add support pillar attr for apt-cacher

Fix broken link

Add apt-cacher-ng states to apt-cacher-formula

Updated the README.rst to follow a better layout

Pull request for initial apt-cacher-formula