List l7poclies by listener

Sample CLI:
openstack loadbalancer l7policy list --listener <Name or ID>

Story: 2006617
Task: 36820

Change-Id: Ie02b5a4bbec7243806a0a9523897dd82e6737482

octaviaclient/osc/v2/l7policy.py

@@ -153,12 +153,21 @@ class ListL7Policy(lister.Lister):
     def get_parser(self, prog_name):
         parser = super(ListL7Policy, self).get_parser(prog_name)
 
+        parser.add_argument(
+            '--listener',
+            help="List l7policies that applied to the given listener "
+                 "(name or ID)."
+        )
+
         return parser
 
     def take_action(self, parsed_args):
         columns = const.L7POLICY_COLUMNS
 
-        data = self.app.client_manager.load_balancer.l7policy_list()
+        attrs = v2_utils.get_l7policy_attrs(self.app.client_manager,
+                                            parsed_args)
+
+        data = self.app.client_manager.load_balancer.l7policy_list(**attrs)
         formatters = {'rules': v2_utils.format_list}
 
         return (columns,

octaviaclient/tests/unit/osc/v2/test_l7policy.py

@@ -60,6 +60,23 @@ class TestL7PolicyList(TestL7Policy):
         self.assertEqual(self.columns, columns)
         self.assertEqual(self.datalist, tuple(data))
 
+    @mock.patch('octaviaclient.osc.v2.utils.get_l7policy_attrs')
+    def test_l7policy_list_by_listener(self, mock_l7policy_attrs):
+        mock_l7policy_attrs.return_value = {
+            'listener_id': self._l7po.listener_id,
+        }
+        arglist = ['--listener', 'mock_li_id']
+        verifylist = [('listener', 'mock_li_id')]
+
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+        columns, data = self.cmd.take_action(parsed_args)
+
+        self.api_mock.l7policy_list.assert_called_with(
+            listener_id=self._l7po.listener_id
+        )
+        self.assertEqual(self.columns, columns)
+        self.assertEqual(self.datalist, tuple(data))
+
 
 class TestL7PolicyDelete(TestL7Policy):
 

releasenotes/notes/list-l7policies-by-listener-a11322c8e03a11e9.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Added support to query l7policies by a given listener using ``--listener``.