Remove references to 'sys.version_info'

We support Python 3.6 as a minimum now, making these checks no-ops.

Change-Id: Ibaa2cdb7cc27f541aeb778782813354df2911156

oslo_service/service.py

@@ -197,12 +197,11 @@ class SignalHandler(metaclass=Singleton):
     def __setup_signal_interruption(self):
         """Set up to do the Right Thing with signals during poll() and sleep().
 
-        For Python 3.5 and later, deal with the changes in PEP 475 that prevent
-        a signal from interrupting eventlet's call to poll() or sleep().
+        Deal with the changes introduced in PEP 475 that prevent a signal from
+        interrupting eventlet's call to poll() or sleep().
         """
         select_module = eventlet.patcher.original('select')
-        self.__force_interrupt_on_signal = (sys.version_info >= (3, 5) and
-                                            hasattr(select_module, 'poll'))
+        self.__force_interrupt_on_signal = hasattr(select_module, 'poll')
 
         if self.__force_interrupt_on_signal:
             try:

oslo_service/tests/test_service.py

@@ -476,7 +476,6 @@ class ProcessLauncherTest(base.ServiceBaseTestCase):
             m.assert_called_once_with(signal.SIGTERM, 'test')
         signal_handler.clear()
 
-    @mock.patch('sys.version_info', (3, 5))
     def test_setup_signal_interruption_no_select_poll(self):
         # NOTE(claudiub): SignalHandler is a singleton, which means that it
         # might already be initialized. We need to clear to clear the cache
@@ -490,7 +489,6 @@ class ProcessLauncherTest(base.ServiceBaseTestCase):
         self.assertFalse(
             signal_handler._SignalHandler__force_interrupt_on_signal)
 
-    @mock.patch('sys.version_info', (3, 5))
     def test_setup_signal_interruption_select_poll(self):
         # NOTE(claudiub): SignalHandler is a singleton, which means that it
         # might already be initialized. We need to clear to clear the cache