##### SUMMARY
group contains call to Display.deprecated or AnsibleModule.deprecate and is scheduled for removal

```
b/ansible/inventory/group.py:54:20: ansible-deprecated-version: Deprecated version ('2.10') found in call to Display.deprecated or AnsibleModule.deprecate
```

##### ISSUE TYPE
 - Bug Report

##### COMPONENT NAME
```
b/ansible/inventory/group.py
```

##### ANSIBLE VERSION
```
2.10
```

##### CONFIGURATION
N/A

##### OS / ENVIRONMENT
N/A

##### STEPS TO REPRODUCE
N/A

##### EXPECTED RESULTS
N/A

##### ACTUAL RESULTS
N/A

self.__init__()
        self.name = data.get('name')
        self.vars = data.get('vars', dict())
        self.depth = data.get('depth', 0)
        self.hosts = data.get('hosts', [])
        self._hosts = None
        parent_groups = data.get('parent_groups', [])
        for parent_data in parent_groups:
            g = Group()
            g.deserialize(parent_data)
            self.parent_groups.append(g)
    def _walk_relationship(self, rel, include_self=False, preserve_ordering=False):
        '''
        Given `rel` that is an iterable property of Group,
        consitituting a directed acyclic graph among all groups,
        Returns a set of all groups in full tree
        A   B    C
        |  / |  /
        | /  | /
        D -> E
        |  /    vertical connections