Update default nova api version to 2.1

Ref:https://review.openstack.org/#/c/311653/
We should use 2.1 as the default nova version now

The API_MIN_VERSION of novaclient has already changed to 2.1

Change-Id: I9ff16cf052556e5d3756f81e02a8e76e8f315df5
Closes-bug: #1588171

openstackclient/compute/client.py

@@ -23,11 +23,12 @@ from openstackclient.i18n import _
 
 LOG = logging.getLogger(__name__)
 
-DEFAULT_API_VERSION = '2'
+DEFAULT_API_VERSION = '2.1'
 API_VERSION_OPTION = 'os_compute_api_version'
 API_NAME = 'compute'
 API_VERSIONS = {
     "2": "novaclient.client",
+    "2.1": "novaclient.client",
 }
 
 # Save the microversion if in use

openstackclient/tests/unit/fakes.py

@@ -38,7 +38,7 @@ _s.add_endpoint(AUTH_URL + ':5000/v2.0')
 _s = TEST_RESPONSE_DICT.add_service('network', name='neutron')
 _s.add_endpoint(AUTH_URL + ':9696')
 _s = TEST_RESPONSE_DICT.add_service('compute', name='nova')
-_s.add_endpoint(AUTH_URL + ':8774/v2')
+_s.add_endpoint(AUTH_URL + ':8774/v2.1')
 _s = TEST_RESPONSE_DICT.add_service('image', name='glance')
 _s.add_endpoint(AUTH_URL + ':9292')
 _s = TEST_RESPONSE_DICT.add_service('object', name='swift')

releasenotes/notes/bug-1588171-61214d0ea482988c.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Update novaclient DEFAULT_API_VERSION to 2.1 from 2.0
+    [Bug `1588171 <https://bugs.launchpad.net/bugs/1588171>`_]