Actively fetch info instead of CONF.compute.min_compute_nodes

This change for `CONF.compute.min_compute_nodes` with use of base method
`is_setup_single_compute` allows to reduce CI maintained configuration
over the long-run.

Related-Bug: #OSPRH-15895
Change-Id: Ia50077d499849fae4f0f30b4576b9242919acc9d

whitebox_neutron_tempest_plugin/tests/scenario/base.py

@@ -715,11 +715,11 @@ class BaseTempestWhiteboxTestCase(base.BaseTempestTestCase):
                 network_id)['network']['provider:segmentation_id']
             params['user_data'] = build_user_data(net_vlan)
             params['config_drive'] = True
-        if (different_host and CONF.compute.min_compute_nodes > 1):
+        if (different_host and not self.is_setup_single_compute()):
             params['scheduler_hints'] = {
                 'different_host': different_host['id']}
         server = self.create_server(**params)['server']
-        if different_host and CONF.compute.min_compute_nodes > 1:
+        if different_host and not self.is_setup_single_compute():
             if (self.get_host_for_server(different_host['id']) ==
                     self.get_host_for_server(server['id'])):
                 raise self.skipException(

whitebox_neutron_tempest_plugin/tests/scenario/test_broadcast.py

@@ -133,7 +133,7 @@ class BaseBroadcastTest(object):
                 {'name': self.secgroup['security_group']['name']}],
             'name': data_utils.rand_name(server_type)
         }
-        if not (CONF.compute.min_compute_nodes > 1):
+        if self.is_setup_single_compute():
             LOG.debug('number of compute nodes is not higher than 1 - '
                       'scheduler_hints will not be used')
         elif scheduler_hints:

whitebox_neutron_tempest_plugin/tests/scenario/test_dvr_ovn.py

@@ -342,9 +342,6 @@ class OvnDvrTest(OvnDvrBase):
     @decorators.idempotent_id('f8fd0fbd-4ad3-4b0b-b805-6c59228bc5d8')
     @testtools.skipUnless(CONF.compute_feature_enabled.live_migration,
                           'Live migration is not available.')
-    @testtools.skipUnless(CONF.compute.min_compute_nodes > 1,
-                          'Less than 2 compute nodes, skipping multinode '
-                          'tests.')
     @decorators.attr(type='slow')
     @utils.services('compute', 'network')
     def test_validate_dvr_connectivity_live_migration_basic(self):
@@ -386,6 +383,8 @@ class OvnDvrTest(OvnDvrBase):
         7. Repeat steps 3 and 4.
 
         """
+        if self.is_setup_single_compute():
+            raise self.skipException('Test needs more than 1 compute')
         self._setup()
         server2 = self._create_server(
             exclude_hosts=self.exclude_hosts)
@@ -487,9 +486,6 @@ class OvnDvrTest(OvnDvrBase):
     @decorators.idempotent_id('609997ab-bffc-40e5-a858-635099df4db9')
     @testtools.skipUnless(CONF.compute_feature_enabled.live_migration,
                           'Live migration is not available.')
-    @testtools.skipUnless(CONF.compute.min_compute_nodes > 1,
-                          'Less than 2 compute nodes, skipping multinode '
-                          'tests.')
     @decorators.attr(type='slow')
     @utils.services('compute', 'network')
     def test_validate_dvr_connectivity_live_migration_different_networks(self):
@@ -498,6 +494,8 @@ class OvnDvrTest(OvnDvrBase):
 
         Plase see previous test description for more details
         """
+        if self.is_setup_single_compute():
+            raise self.skipException('Test needs more than 1 compute')
         self.create_security_group(
             name=data_utils.rand_name('secgroup'))
         self.create_loginable_secgroup_rule(

whitebox_neutron_tempest_plugin/tests/scenario/test_multicast.py

@@ -1044,7 +1044,7 @@ class MulticastTestVlanTransparency(MulticastTestIPv4):
                 {'name': self.secgroup['security_group']['name']}],
             'name': data_utils.rand_name('multicast-server-vlan-transparent')
         }
-        if (different_host and CONF.compute.min_compute_nodes > 1):
+        if (different_host and not self.is_setup_single_compute()):
             params['scheduler_hints'] = {
                 'different_host': different_host['id']}
         server = self.create_server(**params)['server']

whitebox_neutron_tempest_plugin/tests/scenario/test_qos.py

@@ -913,11 +913,10 @@ class QosTestCommon(QosBaseTest):
     @decorators.idempotent_id('121bd2dd-6d41-4658-8a05-6fdd444381fa')
     @testtools.skipUnless(CONF.compute_feature_enabled.live_migration,
                           'Live migration is not available.')
-    @testtools.skipUnless(
-        CONF.compute.min_compute_nodes > 1,
-        'Less than 2 compute nodes, skipping multinode tests.')
     @decorators.attr(type='slow')
     def test_qos_after_live_migration(self):
+        if self.is_setup_single_compute():
+            raise self.skipException('Test needs more than 1 compute')
         src_server, dst_server = (
             self._create_vms_by_topology(different_host=False))
         self._test_qos_after_migration(
@@ -926,11 +925,10 @@ class QosTestCommon(QosBaseTest):
     @decorators.idempotent_id('f6e1e433-33b1-4352-bdf3-92dbe9e3f2ee')
     @testtools.skipUnless(CONF.compute_feature_enabled.cold_migration,
                           'Cold migration is not available.')
-    @testtools.skipUnless(
-        CONF.compute.min_compute_nodes > 1,
-        'Less than 2 compute nodes, skipping multinode tests.')
     @decorators.attr(type='slow')
     def test_qos_after_cold_migration(self):
+        if self.is_setup_single_compute():
+            raise self.skipException('Test needs more than 1 compute')
         src_server, dst_server = self._create_vms_by_topology()
         self._test_qos_after_migration(
             src_server, dst_server, migration_method='cold-migration')
@@ -1025,12 +1023,10 @@ class QosTestExternalNetwork(QosBaseTest):
         super(QosTestExternalNetwork, self).setUp()
         self.ensure_external_network_is_shared()
 
-    @testtools.skipUnless(
-        CONF.compute.min_compute_nodes > 1,
-        'BW limit rules applied to provider network can only be tested when '
-        'there is more than one compute')
     @decorators.idempotent_id('c018b96b-47eb-4b5f-b750-e0c857fd86a9')
     def test_dscp_bwlimit_external_network(self):
+        if self.is_setup_single_compute():
+            raise self.skipException('Test needs more than 1 compute')
         max_kbps = self.bwlimit_kbps_net
         dscp_mark = self.dscp_mark_net
 

whitebox_neutron_tempest_plugin/tests/scenario/test_vrrp.py

@@ -78,7 +78,7 @@ class VrrpTest(base.BaseTempestTestCaseAdvanced):
             'key_name': self.keypair['name'],
             'name': name
         }
-        if (scheduler_hints and CONF.compute.min_compute_nodes > 1 and
+        if (scheduler_hints and not self.is_setup_single_compute() and
                 compute.is_scheduler_filter_enabled("DifferentHostFilter")):
             params['scheduler_hints'] = scheduler_hints
         vm = self.create_server(networks=[{'port': port['id']}], **params)
@@ -176,7 +176,7 @@ class VrrpTest(base.BaseTempestTestCaseAdvanced):
 
         if (self._get_vm_host(vm1['server']['id']) ==
                 self._get_vm_host(vm2['server']['id']) and
-                CONF.compute.min_compute_nodes > 1):
+                not self.is_setup_single_compute()):
             raise self.skipException(
                 "VMs are running on the same host."
                 "Make sure you have DifferentHostFilter enabled in nova.conf "