Refs #4222: Rename the Rudder variable rudder_dependencies with rudder_t...

...ools to avoid meaning collision with NCF

Ticket: http://www.rudder-project.org/redmine/issues/4222

To be merged in 2.9

![I want you to merge this meme](https://github-camo.global.ssl.fastly.net/5e625c6296a67da465ffccdb382e318a6af02d63/687474703a2f2f692e696d6775722e636f6d2f64527542422e6a7067 "I want you to merge this")