Add support for microversion 2.31

Microversion 2.31 fixes a bug in os-console-auth-tokens API and doesn't
require any changes in the novaclient.

Change-Id: I275903aeb3ff048397ab592ecbe0cdd570350c41
Implements: blueprint fix-console-auth-tokens

novaclient/__init__.py

@@ -25,4 +25,4 @@ API_MIN_VERSION = api_versions.APIVersion("2.1")
 # when client supported the max version, and bumped sequentially, otherwise
 # the client may break due to server side new version may include some
 # backward incompatible change.
-API_MAX_VERSION = api_versions.APIVersion("2.30")
+API_MAX_VERSION = api_versions.APIVersion("2.31")

novaclient/tests/unit/v2/test_shell.py

@@ -2851,6 +2851,7 @@ class ShellTest(utils.TestCase):
                  #   headers, and is tested in test_api_versions, but is
                  #   not explicitly tested via wraps and _SUBSTITUTIONS.
             28,  # doesn't require any changes in novaclient
+            31,  # doesn't require any changes in novaclient
         ])
         versions_supported = set(range(0,
                                  novaclient.API_MAX_VERSION.ver_minor + 1))

releasenotes/notes/microversion-v2_31-3e1a16eb5eb53f59.yaml

@@ -0,0 +1,4 @@
+---
+upgrade:
+  - Support for microversion 2.31 which fixes a bug in the
+    os-console-auth-tokens API