def remove_tags(jobflow_id, keys)
      params = {
        :operation => 'RemoveTags',
        :resource_id => jobflow_id,
        :tag_keys => keys
      }
      aws_result = @aws_request.submit(params)
      yield aws_result if block_given?
    end
def remove_tags(jobflow_id, keys)
      params = {
        :operation => 'RemoveTags',
        :resource_id => jobflow_id,
        :tag_keys => keys
      }
      aws_result = @aws_request.submit(params)
      yield aws_result if block_given?
    end
Remove the specified tags on all instances in the specified jobflow

   emr.remove_tags('j-123', ['key1','key_only2'])

 See http://docs.aws.amazon.com/ElasticMapReduce/latest/API/API_RemoveTags.html