Adjust Rubocop rules to be more relaxed w/r/t readability
Remove Stove, use Berkshelf 3
Rubocop fixes

* %w-literals should be delimited by ( and )
* Use underscore for unused block argument to indicate it's not used
* Remove block arguments when unneeded
* Use \ instead of + or << to concatenate those strings.
* Use nested module/class definitions instead of compact style
    * Still uses some nesting, b/c we need to ensure things are nested properly
Remove references to Berkshelf 2 stuff, use published et_hostname
Add missing dependency to metadata
Update access_control trusted_networks data bag item
Fix node attribute for ChefSpec tests
Install community version of haproxyctl & add tests

Tests pass! Though other tests don't :sad panda: