[OVN] Remove the check of presence of "Chassis_Private"

Since [1], Neutron removed the compatibility for OVN < v20.09. That
implies the SB table "Chassis_Private" is always present.

[1]https://review.opendev.org/c/openstack/neutron/+/884898

Related-Bug: #2002839
Signed-off-by: Rodolfo Alonso Hernandez <ralonsoh@redhat.com>
Change-Id: I7a9bd38c2df372d9eb7dc1a966a41c65c2d7ce17

neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py

@@ -1603,14 +1603,11 @@ def delete_agent(self, context, id, _driver=None):
     chassis_name = agent['configurations']['chassis_name']
     _driver.sb_ovn.chassis_del(chassis_name, if_exists=True).execute(
         check_error=True)
-    if _driver.sb_ovn.is_table_present('Chassis_Private'):
-        # TODO(ralonsoh): implement the corresponding chassis_private
-        # commands in ovsdbapp.
-        try:
-            _driver.sb_ovn.db_destroy('Chassis_Private', chassis_name).execute(
-                check_error=True)
-        except idlutils.RowNotFound:
-            pass
+    try:
+        _driver.sb_ovn.db_destroy('Chassis_Private', chassis_name).execute(
+            check_error=True)
+    except idlutils.RowNotFound:
+        pass
     # Send a specific event that all API workers can get to delete the agent
     # from their caches. Ideally we could send a single transaction that both
     # created and deleted the key, but alas python-ovs is too "smart"

neutron/tests/functional/plugins/ml2/drivers/ovn/mech_driver/test_mech_driver.py

@@ -1403,11 +1403,10 @@ class TestAgentApi(base.TestOVNFunctionalBase):
     def _check_chassis_registers(self, present=True):
         chassis = self.sb_api.lookup('Chassis', self.chassis, default=None)
         chassis_name = chassis.name if chassis else None
-        if self.sb_api.is_table_present('Chassis_Private'):
-            ch_private = self.sb_api.lookup(
-                'Chassis_Private', self.chassis, default=None)
-            ch_private_name = ch_private.name if ch_private else None
-            self.assertEqual(chassis_name, ch_private_name)
+        ch_private = self.sb_api.lookup(
+            'Chassis_Private', self.chassis, default=None)
+        ch_private_name = ch_private.name if ch_private else None
+        self.assertEqual(chassis_name, ch_private_name)
         if present:
             self.assertEqual(self.chassis, chassis_name)
         else: