Make the import tests slightly more robust

I guess in CPython, __file__ will be the path to the pyc if that's how
the library was loaded.  (We don't do that but that difference isn't the
issue here.)  So that makes these tests, which print __file__, sensitive
to whether the last run of the test was through cpython (pyc exists and
__file__ ends in pyc) or through pyston (pyc exists but was wasn't valid
for cpython, and __file__ ends in py)

Just do some canonicalization when printing

test/tests/package_test.py

 import os
 
 import test_package
-print 1, test_package.__name__, os.path.normpath(test_package.__file__)
+print 1, test_package.__name__, os.path.normpath(test_package.__file__).replace(".pyc", ".py")
 
 import test_package.intrapackage_import
 import test_package.absolute_import

test/tests/test_package/absolute_import.py

 import os
 import import_target
 
-print 3, import_target.__name__, os.path.normpath(import_target.__file__)
+print 3, import_target.__name__, os.path.normpath(import_target.__file__).replace(".pyc", ".py")

test/tests/test_package/absolute_import_with_future.py

@@ -2,4 +2,4 @@ from __future__ import absolute_import
 import os
 import import_target
 
-print 4, import_target.__name__, os.path.normpath(import_target.__file__)
+print 4, import_target.__name__, os.path.normpath(import_target.__file__).replace(".pyc", ".py")

test/tests/test_package/intrapackage_import.py

 import os
 from . import import_target
-print 2, import_target.__name__, os.path.normpath(import_target.__file__)
+print 2, import_target.__name__, os.path.normpath(import_target.__file__).replace(".pyc", ".py")