Fix flake8 errors related to vyos.vyos collection (#66516)

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

lib/ansible/plugins/cliconf/vyos.py

@@ -33,12 +33,10 @@ version_added: "2.4"
 import re
 import json
 
-from itertools import chain
-
 from ansible.errors import AnsibleConnectionFailure
 from ansible.module_utils._text import to_text
 from ansible.module_utils.common._collections_compat import Mapping
-from ansible.module_utils.network.common.config import NetworkConfig, dumps
+from ansible.module_utils.network.common.config import NetworkConfig
 from ansible.module_utils.network.common.utils import to_list
 from ansible.plugins.cliconf import CliconfBase
 

test/units/modules/network/vyos/test_vyos_banner.py

@@ -51,5 +51,4 @@ class TestVyosBannerModule(TestVyosModule):
 
     def test_vyos_banner_remove(self):
         set_module_args(dict(banner='pre-login', state='absent'))
-        commands = ['delete system login banner pre-login']
         self.execute_module(changed=False, commands=[])

test/units/modules/network/vyos/test_vyos_facts.py

@@ -94,4 +94,4 @@ class TestVyosFactsModule(TestVyosModule):
 
     def test_vyos_facts_invalid_subset(self):
         set_module_args(dict(gather_subset='cereal'))
-        result = self.execute_module(failed=True)
+        self.execute_module(failed=True)