Fix flake8 errors for iosxr tests (#65860)

These were noticed when we migrated to the cisco.iosxr collection.

Signed-off-by: Paul Belanger <pabelanger@redhat.com>

test/units/modules/network/iosxr/test_iosxr_config.py

@@ -90,7 +90,6 @@ class TestIosxrConfigModule(TestIosxrModule):
     def test_iosxr_config_lines_w_parents(self):
         lines = ['shutdown']
         parents = ['interface GigabitEthernet0/0']
-        candidate = parents + lines
         set_module_args(dict(lines=lines, parents=parents))
         module = MagicMock()
         module.params = {'lines': lines, 'parents': parents, 'src': None}
@@ -194,29 +193,29 @@ class TestIosxrConfigModule(TestIosxrModule):
     def test_iosxr_config_src_and_lines_fails(self):
         args = dict(src='foo', lines='foo')
         set_module_args(args)
-        result = self.execute_module(failed=True)
+        self.execute_module(failed=True)
 
     def test_iosxr_config_src_and_parents_fails(self):
         args = dict(src='foo', parents='foo')
         set_module_args(args)
-        result = self.execute_module(failed=True)
+        self.execute_module(failed=True)
 
     def test_iosxr_config_match_exact_requires_lines(self):
         args = dict(match='exact')
         set_module_args(args)
-        result = self.execute_module(failed=True)
+        self.execute_module(failed=True)
 
     def test_iosxr_config_match_strict_requires_lines(self):
         args = dict(match='strict')
         set_module_args(args)
-        result = self.execute_module(failed=True)
+        self.execute_module(failed=True)
 
     def test_iosxr_config_replace_block_requires_lines(self):
         args = dict(replace='block')
         set_module_args(args)
-        result = self.execute_module(failed=True)
+        self.execute_module(failed=True)
 
     def test_iosxr_config_replace_config_requires_src(self):
         args = dict(replace='config')
         set_module_args(args)
-        result = self.execute_module(failed=True)
+        self.execute_module(failed=True)

test/units/modules/network/iosxr/test_iosxr_system.py

@@ -80,7 +80,6 @@ class TestIosxrSystemModule(TestIosxrModule):
     def test_iosxr_system_name_servers(self):
         name_servers = ['8.8.8.8', '8.8.4.4', '1.1.1.1']
         set_module_args(dict(name_servers=name_servers))
-        commands = ['domain name-server 1.1.1.1', 'no domain name-server 8.8.4.4', 'no domain lookup disable']
         self.execute_module(changed=True)
 
     def test_iosxr_system_state_absent(self):