Fixed DS Package Conf dir, Separated Attribute for recipe,

- Added License info to recipe
- Added Chef note to templates
- Fixed `node.cassandra.conf_dir` location for package setup
- Separated attributes for recipe
- Moved default.rb attribute file to common.rb
- Moved recipe attributes to recipe (possible fix for override attr in wrapper recipe)
- Added missing restart notify for tarball recipe
- Removed limits template

Tested changes for both deb & rhel.