Add support for P and Q release names

The P and Q releases have been named [1], add them to
versionutils.

[1] http://lists.openstack.org/pipermail/openstack-dev/2016-August/101891.html

Change-Id: I0f386048cdd63fd757c6833d5fb4c1d1441c9d7a

oslo_log/tests/unit/test_versionutils.py

@@ -354,7 +354,22 @@ class DeprecatedTestCase(test_base.BaseTestCase):
         self.assert_deprecated(mock_reporter,
                                what='OutdatedClass()',
                                as_of='Newton',
-                               remove_in='P')
+                               remove_in='Pike')
+
+    @mock.patch('oslo_log.versionutils.report_deprecated_feature')
+    def test_deprecated_ocata_plus_two(self, mock_reporter):
+
+        @versionutils.deprecated(as_of=versionutils.deprecated.OCATA,
+                                 remove_in=+2)
+        class OutdatedClass(object):
+            pass
+        obj = OutdatedClass()
+
+        self.assertIsInstance(obj, OutdatedClass)
+        self.assert_deprecated(mock_reporter,
+                               what='OutdatedClass()',
+                               as_of='Ocata',
+                               remove_in='Queens')
 
     @mock.patch('oslo_log.versionutils.report_deprecated_feature')
     def test_deprecated_message(self, mock_reporter):

oslo_log/versionutils.py

@@ -68,6 +68,8 @@ _RELEASES = {
     'M': 'Mitaka',
     'N': 'Newton',
     'O': 'Ocata',
+    'P': 'Pike',
+    'Q': 'Queens',
 }
 
 
@@ -140,6 +142,8 @@ class deprecated(object):
     MITAKA = 'M'
     NEWTON = 'N'
     OCATA = 'O'
+    PIKE = 'P'
+    QUEENS = 'Q'
 
     def __init__(self, as_of, in_favor_of=None, remove_in=2, what=None):
         """Initialize decorator