While working on reproducible builds for openSUSE, I found that
python3-img-proof fails to build from source.

Steps to reproduce:
osc co openSUSE:Factory/python3-img-proof && cd $_ 
osc build --noservice --clean

Actual results
Traceback (most recent call last):
  File "setup.py", line 44, in <module>
[...]
  File "/usr/lib/python3.8/site-packages/pkg_resources/__init__.py", line 2449,
in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/home/abuild/rpmbuild/BUILD/img-proof-6.1.0/img_proof/scripts/cli.py",
line 38, in <module>
    from img_proof.ipa_controller import collect_tests, test_image
  File
"/home/abuild/rpmbuild/BUILD/img-proof-6.1.0/img_proof/ipa_controller.py", line
29, in <module>
    from img_proof.ipa_azure import AzureCloud
  File "/home/abuild/rpmbuild/BUILD/img-proof-6.1.0/img_proof/ipa_azure.py",
line 25, in <module>
    from azure.common.client_factory import get_client_from_auth_file
  File "/usr/lib/python3.8/site-packages/azure/common/client_factory.py", line
17, in <module>
    from .credentials import get_azure_cli_credentials
  File "/usr/lib/python3.8/site-packages/azure/common/credentials.py", line
122, in <module>
    raise ImportError("You need to install 'msrestazure' to use this feature")
ImportError: You need to install 'msrestazure' to use this feature