applied 2to3 conversion to iptest, test_bool

In addition to convert iptest, I also did test_bool to make a rudimentary check.
```
$ ./IronPythonTestConsole.exe  IronPythonTest -noh -labels -full -test:IronPythonTest.Cases.IronPythonCases.test_bool
Runtime Environment -
    OS Version: Microsoft Windows NT 6.1.7601 Service Pack 1
  .NET Version: 4.0.30319.18444

***** IronPythonTest.DLL
***** IronPythonCases
***** IronPythonTests
***** test_bool
>>>   0.00s testing test__coerce__
>>>   0.10s testing test__float__
>>>   0.13s testing test__index__
>>>   0.14s testing test__long__
>>>   0.15s testing test__rdivmod__
>>>   0.20s testing test_bool_dir
>>>   0.31s testing test_decimal
>>>   0.37s testing test_types

8 tests passed
Tests run: 1, Passed: 1, Errors: 0, Failures: 0, Inconclusive: 0
  Not run: 0, Invalid: 0, Ignored: 0, Skipped: 0
Elapsed time: 00:00:10.5490000
```