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Python3.6.9 azure-storage-blob: TypeError: new enumerations must be created as `ClassName([mixin_type,] enum_type)`

See original GitHub issue

Package Name: azure-storage-blob
Package Version: 12.7.0, 12.7.1
Operating System: Ubuntu
Python Version: 3.6.9

Describe the bug A clear and concise description of what the bug is.

Python 3.6.9 (default, Jul  3 2019, 15:36:16)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import azure.storage.blob
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/__init__.py", line 10, in <module>
    from ._blob_client import BlobClient
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_blob_client.py", line 24, in <module>
    from ._shared.base_client import StorageAccountHostsMixin, parse_connection_str, parse_query
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_shared/base_client.py", line 44, in <module>
    from .constants import STORAGE_OAUTH_SCOPE, SERVICE_HOST_BASE, CONNECTION_TIMEOUT, READ_TIMEOUT
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_shared/constants.py", line 8, in <module>
    from .._generated import AzureBlobStorage
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_generated/__init__.py", line 9, in <module>
    from ._azure_blob_storage import AzureBlobStorage
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_generated/_azure_blob_storage.py", line 19, in <module>
    from .operations import ServiceOperations
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_generated/operations/__init__.py", line 9, in <module>
    from ._service_operations import ServiceOperations
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_generated/operations/_service_operations.py", line 15, in <module>
    from .. import models as _models
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_generated/models/__init__.py", line 10, in <module>
    from ._models_py3 import AccessPolicy
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_generated/models/_models_py3.py", line 15, in <module>
    from ._azure_blob_storage_enums import *
  File "/home/qizhen/.local/lib/python3.6/site-packages/azure/storage/blob/_generated/models/_azure_blob_storage_enums.py", line 29, in <module>
    class AccessTier(with_metaclass(_CaseInsensitiveEnumMeta, str, Enum)):
  File "/usr/lib/python3.6/enum.py", line 119, in __prepare__
    member_type, first_enum = metacls._get_mixins_(bases)
  File "/usr/lib/python3.6/enum.py", line 441, in _get_mixins_
    raise TypeError("new enumerations must be created as "
TypeError: new enumerations must be created as `ClassName([mixin_type,] enum_type)`

To Reproduce Steps to reproduce the behavior: