##### SUMMARY
`docker_container` should so some sanity checks that not two volumes / mount points use the same target inside the container, so that especially when recreating containers, they won't be destroyed first before recreating fails.

This becomes more important once #49808 is merged.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
docker_container

##### ANSIBLE VERSION
```
2.8.0
```

memory_swap=host_config.get('MemorySwap'),
            ))
        differences = DifferenceTracker()
        for key, value in config_mapping.items():
            minimal_version = self.parameters.client.option_minimal_versions.get(key, {})
            if not minimal_version.get('supported', True):
                continue
            compare = self.parameters.client.comparisons[self.parameters_map.get(key, key)]
            self.log('check differences %s %s vs %s (%s)' % (key, getattr(self.parameters, key), str(value), compare))
            if getattr(self.parameters, key, None) is not None:
                match = self._compare(getattr(self.parameters, key), value, compare)
                if not match:
                    
                    p = getattr(self.parameters, key)
                    c = value
                    if compare['type'] == 'set':
                        
                        if p is not None:
                            p = sorted(p)
                        if c is not None:
                            c = sorted(c)
                    elif compare['type'] == 'set(dict)':
                        
                        if key == 'expected_mounts':
                            
                            def sort_key_fn(x):
                                return x['target']
                        else:
                            
                            def sort_key_fn(x):