Experimental parser: remove bad import

tools/lexer_generator/test_suite.py

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 from unittest import TestLoader, TextTestRunner, TestSuite
 
-from action_test import *
 from automata_test import *
 from code_generator_test import *
 from lexer_test import *
 from rule_parser_test import *
 from transition_key_test import *
 
 if __name__ == "__main__":
   loader = TestLoader()
   suite = TestSuite((
     loader.loadTestsFromTestCase(TransitionKeyTestCase),
     loader.loadTestsFromTestCase(AutomataTestCase),
     loader.loadTestsFromTestCase(RuleParserTestCase),
     loader.loadTestsFromTestCase(LexerTestCase),
     loader.loadTestsFromTestCase(CodeGeneratorTestCase),
   ))
   runner = TextTestRunner(verbosity = 2)
   runner.run(suite)