Remove outdated comment and suppressed exception from test_test.py

The test command has not called sys.exit since commit
2c4fd432.

setuptools/tests/test_test.py

@@ -86,8 +86,6 @@ def test_test(capfd):
     dist.script_name = 'setup.py'
     cmd = test(dist)
     cmd.ensure_finalized()
-    # The test runner calls sys.exit
-    with contexts.suppress_exceptions(SystemExit):
     cmd.run()
     out, err = capfd.readouterr()
     assert out == 'Foo\n'
@@ -120,8 +118,6 @@ def test_tests_are_run_once(capfd):
     dist.script_name = 'setup.py'
     cmd = test(dist)
     cmd.ensure_finalized()
-    # The test runner calls sys.exit
-    with contexts.suppress_exceptions(SystemExit):
     cmd.run()
     out, err = capfd.readouterr()
     assert out == 'Foo\n'