[config reload] Fix invalid rstrip. (#2157)

What I did
'rstrip' behavior is wrong, if unit is 'gnmi.timer', the result is 'gn', and 'gnmi' is expected.

How I did it
Use 're.sub' to replace 'rstrip'.

How to verify it
Run unit test for sonic-utilities.

Signed-off-by: Gang Lv ganglv@microsoft.com

config/main.py

@@ -746,7 +746,7 @@ def _get_delayed_sonic_services():
     services = []
     for unit in timer:
         if state[timer.index(unit)] == "enabled":
-            services.append(unit.rstrip(".timer"))
+            services.append(re.sub('\.timer$', '', unit, 1))
     return services
 
 

tests/config_test.py

@@ -89,6 +89,22 @@ def mock_run_command_side_effect(*args, **kwargs):
         else:
             return ''
 
+def mock_run_command_side_effect_gnmi(*args, **kwargs):
+    command = args[0]
+
+    if kwargs.get('display_cmd'):
+        click.echo(click.style("Running command: ", fg='cyan') + click.style(command, fg='green'))
+
+    if kwargs.get('return_cmd'):
+        if command == "systemctl list-dependencies --plain sonic-delayed.target | sed '1d'":
+            return 'gnmi.timer'
+        elif command == "systemctl list-dependencies --plain sonic.target | sed '1d'":
+            return 'swss'
+        elif command == "systemctl is-enabled gnmi.timer":
+            return 'enabled'
+        else:
+            return ''
+
 
 # Load sonic-cfggen from source since /usr/local/bin/sonic-cfggen does not have .py extension.
 sonic_cfggen = load_module_from_source('sonic_cfggen', '/usr/local/bin/sonic-cfggen')
@@ -168,6 +184,22 @@ def test_load_minigraph(self, get_cmd_module, setup_single_broadcom_asic):
             mock_run_command.assert_any_call('systemctl reset-failed snmp')
             assert mock_run_command.call_count == 11
 
+    def test_load_minigraph_with_gnmi_timer(self, get_cmd_module, setup_single_broadcom_asic):
+        with mock.patch("utilities_common.cli.run_command", mock.MagicMock(side_effect=mock_run_command_side_effect_gnmi)) as mock_run_command:
+            (config, show) = get_cmd_module
+            runner = CliRunner()
+            result = runner.invoke(config.config.commands["load_minigraph"], ["-y"])
+            print(result.exit_code)
+            print(result.output)
+            traceback.print_tb(result.exc_info[2])
+            assert result.exit_code == 0
+            assert "\n".join([l.rstrip() for l in result.output.split('\n')]) == load_minigraph_command_output
+            # Verify "systemctl reset-failed" is called for services under sonic.target
+            mock_run_command.assert_any_call('systemctl reset-failed swss')
+            # Verify "systemctl reset-failed" is called for services under sonic-delayed.target
+            mock_run_command.assert_any_call('systemctl reset-failed gnmi')
+            assert mock_run_command.call_count == 11
+
     def test_load_minigraph_with_port_config_bad_format(self, get_cmd_module, setup_single_broadcom_asic):
         with mock.patch(
             "utilities_common.cli.run_command",