network: Add missing subnet unset --gateway <subnet-id>

Story: 2008695
Task: 42003
Change-Id: I9486a09531b11f27a9ff0d68fd4ad8c68a65cccf

Author: brtkwr

openstackclient/network/v2/subnet.py

@@ -672,6 +672,11 @@ def get_parser(self, prog_name):
                    'subnet e.g.: start=192.168.199.2,end=192.168.199.254 '
                    '(repeat option to unset multiple allocation pools)')
         )
+        parser.add_argument(
+            '--gateway',
+            action='store_true',
+            help=_("Remove gateway IP from this subnet")
+        )
         parser.add_argument(
             '--dns-nameserver',
             metavar='<dns-nameserver>',
@@ -715,6 +720,8 @@ def take_action(self, parsed_args):
         obj = client.find_subnet(parsed_args.subnet, ignore_missing=False)
 
         attrs = {}
+        if parsed_args.gateway:
+            attrs['gateway_ip'] = None
         if parsed_args.dns_nameservers:
             attrs['dns_nameservers'] = copy.deepcopy(obj.dns_nameservers)
             _update_arguments(attrs['dns_nameservers'],

openstackclient/tests/unit/network/v2/test_subnet.py

@@ -1264,6 +1264,7 @@ def setUp(self):
                                    'end': '8.8.8.170'}],
              'service_types': ['network:router_gateway',
                                'network:floatingip_agent_gateway'],
+             'gateway_ip': 'fe80::a00a:0:c0de:0:1',
              'tags': ['green', 'red'], })
         self.network.find_subnet = mock.Mock(return_value=self._testsubnet)
         self.network.update_subnet = mock.Mock(return_value=None)
@@ -1277,6 +1278,7 @@ def test_unset_subnet_params(self):
             '--host-route', 'destination=10.30.30.30/24,gateway=10.30.30.1',
             '--allocation-pool', 'start=8.8.8.100,end=8.8.8.150',
             '--service-type', 'network:router_gateway',
+            '--gateway',
             self._testsubnet.name,
         ]
         verifylist = [
@@ -1286,6 +1288,7 @@ def test_unset_subnet_params(self):
             ('allocation_pools', [{
                 'start': '8.8.8.100', 'end': '8.8.8.150'}]),
             ('service_types', ['network:router_gateway']),
+            ('gateway', True),
         ]
 
         parsed_args = self.check_parser(self.cmd, arglist, verifylist)
@@ -1297,6 +1300,7 @@ def test_unset_subnet_params(self):
                 "destination": "10.20.20.0/24", "nexthop": "10.20.20.1"}],
             'allocation_pools': [{'start': '8.8.8.160', 'end': '8.8.8.170'}],
             'service_types': ['network:floatingip_agent_gateway'],
+            'gateway_ip': None,
         }
         self.network.update_subnet.assert_called_once_with(
             self._testsubnet, **attrs)

releasenotes/notes/subnet-unset-gateway-20239d5910e10778.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Add missing ``openstack subnet unset --gateway <subnet-id>``.