Fix the missing of guest-agent.conf in guest vm

This PS sets the injected_config_owner to ubuntu and the injected_config_group to root.
Story: 2010231
Task: 46023

Change-Id: I77f9d0332a123594eae434c6e1cc795242e4022d

releasenotes/notes/fix-guest-agent-config-missing.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix guest-agent.conf is not generated in trove guest vm.
+    `Stroy 2010231 <https://storyboard.openstack.org/#!/story/2010231>`__

trove/common/cfg.py

@@ -428,10 +428,10 @@ common_opts = [
     cfg.StrOpt('injected_config_location', default='/etc/trove/conf.d',
                help='Path to folder on the Guest where config files will be '
                     'injected during instance creation.'),
-    cfg.StrOpt('injected_config_owner', default='trove',
+    cfg.StrOpt('injected_config_owner', default='ubuntu',
                help='Owner of the Guest Agent directory and files to be '
                     'injected during instance creation.'),
-    cfg.StrOpt('injected_config_group', default='trove',
+    cfg.StrOpt('injected_config_group', default='root',
                help='Group of the Guest Agent directory and files to be '
                     'injected during instance creation.'),
     cfg.StrOpt('guest_config',

trove/tests/unittests/taskmanager/test_models.py

@@ -253,6 +253,11 @@ class FreshInstanceTasksTest(BaseFreshInstanceTasksTest):
 
         self.assertEqual('fake_keypair', server.key_name)
 
+    def test_create_instance_prepare_cloud_config(self):
+        files = {"/tmp/fake_file": "fake text"}
+        user_data = self.freshinstancetasks.prepare_cloud_config(files)
+        self.assertTrue(user_data.startswith('#cloud-config'))
+
     @patch.object(DBInstance, 'get_by')
     def test_create_instance_guestconfig(self, patch_get_by):
         cfg.CONF.set_override('guest_config', self.guestconfig)