Tests that were passing with IronPython 2

[slozier]

The following tests were passing with IronPython 2 but are currently disabled:

• IronPython.test_class (Enable test_class #895)
• IronPython.test_cliclass (Enable test_cliclass #1053)
• IronPython.test_clrexception (Enable test_clrexception #1043)
• IronPython.test_compiler (Enable test_compiler #1059)
• IronPython.test_exec (Enable test_exec #1052)
• IronPython.test_execfile (removed in Remove test_execfile #1049)
• IronPython.test_file (Enable test_file #1039)
• IronPython.test_importpkg
• IronPython.test_inheritance
• IronPython.test_isinstance (Enable test_isinstance #1033)
• IronPython.test_memory (tracked in test_memory fails intermittently #508)
• IronPython.test_protected (Enable test_protected #1032)
• IronPython.test_stdconsole (Enable test_stdconsole #1060)
• IronPython.test_stdmodules (Enable test_stdmodules #1048)
• IronPython.test_syntax (Enable test_syntax #1035)
• IronPython.test_system_timers (test_system_timers is unstable #1037)
• IronPython.test_threadsafety
• IronPython.hosting.editor_svcs.test_errorlistener (Enable some tests #1036)
• IronPython.hosting.editor_svcs.test_tokencategorizer (Enable some tests #1036)
• IronPython.interop.net.field.test_field_misc (Enable some tests #1036)
• IronPython.interop.net.test_accessibility (Enable some tests #1036)
• IronPython.interop.net.test_loadorder (not actually run in IronPython 2)