Providers::AWS calls nonexistent Cheffish::MergedConfig#delete

[justindossey]

in Providers::AWS.get_aws_credentials, the driver_options :aws_config_file and :aws_csv_file are loaded using:

265           if driver_options[:aws_config_file]
266             aws_credentials.load_ini(driver_options.delete(:aws_config_file))
267           elsif driver_options[:aws_csv_file]
268             aws_credentials.load_csv(driver_options.delete(:aws_csv_file))
269           else
270             aws_credentials.load_default
271           end

In this context, driver_options is an instance of Cheffish::MergedConfig, which does not support a delete method. Therefore, :aws_config_file and :aws_csv_file do not work.