Move NeverSudoSystemCommand to separate file.

Library/Homebrew/cask/spec/spec_helper.rb

@@ -66,11 +66,3 @@ RSpec.configure do |config|
     end
   end
 end
-
-module Hbc
-  class NeverSudoSystemCommand < SystemCommand
-    def self.run(command, options = {})
-      super(command, options.merge(sudo: false))
-    end
-  end
-end

Library/Homebrew/cask/test/support/never_sudo_system_command.rb → Library/Homebrew/cask/spec/support/never_sudo_system_command.rb

+require "hbc/system_command"
+
 module Hbc
   class NeverSudoSystemCommand < SystemCommand
     def self.run(command, options = {})