Fix {min|max}_version in ironic Adapter setup

Change If625411f40be0ba642baeb02950f568f43673655 introduced
nova.utils.get_ksa_adapter, which accepts min_version and max_version
kwargs to be passed through to the ksa Adapter constructor. These are
supposed to represent minimum and maximum *major* API versions,
min_version was erroneously set to *microversions* when setting up the
Adapter for ironicclient. This commit changes it to a major version.
(Microversion negotiation is done within ironicclient itself.)

Also, this bug went latent for several releases because a) it only seems
to be triggered when region_name is given in the conf; but also b)
ironicclient has code to discover a reasonable endpoint if passed None.
So this change also adds a warning log if we try and fail to discover
the endpoint via ksa.

Conflicts:
	nova/tests/unit/virt/ironic/test_client_wrapper.py
This was just because the old microversion was 1.38 instead of 1.46. The
patch still changes it to 1.0.

Change-Id: I34a3f8d4a496217eb01790e2d124111625bf5f85
Closes-Bug: #1825583
(cherry picked from commit 13278be)
(cherry picked from commit e6ca383)

nova/tests/unit/virt/ironic/test_client_wrapper.py

@@ -81,7 +81,7 @@ def test__get_client_session(self, mock_ir_cli, mock_session):
         # nova.utils.get_ksa_adapter().get_endpoint()
         self.get_ksa_adapter.assert_called_once_with(
             'baremetal', ksa_auth=self.get_auth_plugin.return_value,
-            ksa_session='session', min_version=(1, 38),
+            ksa_session='session', min_version=(1, 0),
             max_version=(1, ksa_disc.LATEST))
         expected = {'session': 'session',
             'max_retries': CONF.ironic.api_max_retries,
@@ -107,7 +107,7 @@ def test__get_client_session_service_not_found(self, mock_ir_cli,
         # nova.utils.get_endpoint_data
         self.get_ksa_adapter.assert_called_once_with(
             'baremetal', ksa_auth=self.get_auth_plugin.return_value,
-            ksa_session='session', min_version=(1, 38),
+            ksa_session='session', min_version=(1, 0),
             max_version=(1, ksa_disc.LATEST))
         # When get_endpoint_data raises any ServiceNotFound, None is returned.
         expected = {'session': 'session',

nova/virt/ironic/client_wrapper.py

@@ -117,14 +117,20 @@ def _get_client(self, retry_on_conflict=True):
                 ksa_adap = utils.get_ksa_adapter(
                     nova.conf.ironic.DEFAULT_SERVICE_TYPE,
                     ksa_auth=auth_plugin, ksa_session=sess,
-                    min_version=IRONIC_API_VERSION,
+                    min_version=(IRONIC_API_VERSION[0], 0),
                     max_version=(IRONIC_API_VERSION[0], ks_disc.LATEST))
                 ironic_url = ksa_adap.get_endpoint()
+                ironic_url_none_reason = 'returned None'
             except exception.ServiceNotFound:
                 # NOTE(efried): No reason to believe service catalog lookup
                 # won't also fail in ironic client init, but this way will
                 # yield the expected exception/behavior.
                 ironic_url = None
+                ironic_url_none_reason = 'raised ServiceNotFound'
+
+            if ironic_url is None:
+                LOG.warning("Could not discover ironic_url via keystoneauth1: "
+                            "Adapter.get_endpoint %s", ironic_url_none_reason)
 
         try:
             cli = ironic.client.get_client(IRONIC_API_VERSION[0],