Do not vendor cookbooks using Berkshelf anymore

Instead, use the Berkshelf support in knife-solo and the
vagrant-berkshelf plugin on Vagrant

cookbooks/redis/.rubocop.yml

@@ -1,18 +0,0 @@
-LineLength:
-  Max: 80
-  Exclude:
-    - "**/attributes/*.rb"
-    - "**/metadata.rb"
-
-StringLiterals:
-  EnforcedStyle: double_quotes
-
-PercentLiteralDelimiters:
-  PreferredDelimiters:
-    "%w": "[]"  # Arrays use brackets
-
-SingleSpaceBeforeFirstArg:
-  Enabled: false  # too strict about metadata and certain formatting
-
-inherit_from: test/support/rubocop/enabled.yml
-inherit_from: test/support/rubocop/disabled.yml