 Importing ABC directly from collections was deprecated and will be removed in Python 3.10

```
chef/search.py
33:class Search(collections.Sequence):

chef/node.py
7:class NodeAttributes(collections.MutableMapping):
22:        if not isinstance(search_path, collections.Sequence):

chef/base.py
10:class ChefQuery(collections.Mapping):

chef/data_bag.py
35:class DataBagItem(six.with_metaclass(DataBagMeta, ChefObject, collections.MutableMapping)):
```