ios_config: fix "save" arg results in timeout (#21344)

* ios_config: fix "save" arg results in timeout

The command "copy running-config startup-config" prompts for a
destination filename, which was not handled.

~~~
testswitch#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]
0 bytes copied in 0.679 secs (0 bytes/sec)

[15:16]
ios: write memory
~~~

* test_ios_config: adjust test_ios_config_save

lib/ansible/modules/network/ios/ios_config.py

@@ -382,7 +382,7 @@ def main():
 
     if module.params['save']:
         if not module.check_mode:
-            run_commands(module, ['copy running-config startup-config'])
+            run_commands(module, ['copy running-config startup-config\r'])
         result['changed'] = True
 
     module.exit_json(**result)

test/units/modules/network/ios/test_ios_config.py

@@ -75,7 +75,7 @@ class TestIosConfigModule(TestIosModule):
         self.assertEqual(self.get_config.call_count, 0)
         self.assertEqual(self.load_config.call_count, 0)
         args = self.run_commands.call_args[0][1]
-        self.assertIn('copy running-config startup-config', args)
+        self.assertIn('copy running-config startup-config\r', args)
 
     def test_ios_config_lines_wo_parents(self):
         set_module_args(dict(lines=['hostname foo']))