Add --config-file option to tempest cleanup command

As `--config-file` option exists in tempest run command, tempest cleanup command also needs the `--config-file` option.
Without the option, tempest cleanup command always run with default config path(/etc/tempest.conf).
This commit allows tempest cleanup command to run with the exact config file.

Closes-Bug: 2111889
Change-Id: I4fa889bd89aa62ceed080fc59f45320613739384
Signed-off-by: eunkyung <ek121.kim@samsung.com>

releasenotes/notes/add-config-file-option-to-tempest-cleanup-316f019c94bbfcb0.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    A new argument ``--config-file`` has been added to the
+    ``tempest cleanup`` CLI to allow specifying a config file.
+    Without this argument, it will use the default configuration file.

tempest/cmd/cleanup.py

@@ -124,6 +124,7 @@ Runtime Arguments
     complicated logic.
 
 """
+import os
 import sys
 import traceback
 
@@ -148,7 +149,17 @@ class TempestCleanup(command.Command):
 
     GOT_EXCEPTIONS = []
 
+    def _set_conf(self, config_file=None):
+        if config_file:
+            if os.path.exists(os.path.abspath(config_file)):
+                CONF.set_config_path(os.path.abspath(config_file))
+            else:
+                raise FileNotFoundError(
+                    "Config file: %s doesn't exist" % config_file)
+
     def take_action(self, parsed_args):
+        if parsed_args.config_file:
+            self._set_conf(parsed_args.config_file)
         try:
             self.init(parsed_args)
             if not parsed_args.init_saved_state:
@@ -339,6 +350,8 @@ class TempestCleanup(command.Command):
                             "state - all resources present at that moment. "
                             "This option will be ignored if passed with "
                             "--prefix.")
+        parser.add_argument('--config-file', default=None, dest='config_file',
+                            help='Configuration file to cleanup tempest with')
         return parser
 
     def get_description(self):

tempest/tests/cmd/test_cleanup.py

@@ -56,8 +56,10 @@ class TestTempestCleanup(base.TestCase):
         c.GOT_EXCEPTIONS.append('exception')
         mock_cleanup.return_value = True
         mock_init.return_value = True
+        parsed_args = mock.Mock()
+        parsed_args.config_file = []
         try:
-            c.take_action(mock.Mock())
+            c.take_action(parsed_args)
         except Exception as exc:
             self.assertEqual(str(exc), '[\'exception\']')
             return