Add absolute base of the rpm.sys.fm EL6-based package build box

- Includes util library, which has helpers for apt, yum, service
  management, and basic config file manipulation
- Util library will move up a bit higher in the project structure later
- Includes a sysctl helper to add/update sysctl options and reload them
  afterwards

- Base fab tasks so far:
  - upgrades all packages;
  - removes a few annoyance packages (though this may need to change based on
    this being a throwaway build box, the dependency removals on this command
    "went wild," as the kids say);
  - provides a helper task to push up the current user's RSA public key for
    easier access on subsequent connections (definitely something for the util
    module once it gets cleaned up and has options for other types of/paths to
    keys).