update chef-sugar to 3.0 which adds ppc64le support.

omnibus.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |gem|
   gem.test_files = gem.files.grep(/^(test|spec|features)\//)
   gem.require_paths = ['lib']
-  gem.add_dependency 'chef-sugar',       '~> 2.2'
+  gem.add_dependency 'chef-sugar',       '~> 3.0'
   gem.add_dependency 'cleanroom',        '~> 1.0'
   gem.add_dependency 'mixlib-shellout',  '~> 1.4'
   gem.add_dependency 'mixlib-versioning'