lib/azure-fence.py.py: python-msrestazure deprecated

[varkoly]

As described in https://pypi.org/project/msrestazure/ python-msrestazure is deprecated and should be replaced by azure-identity and azure-mgmt-core resp.

[oalbrigt]

It is needed for backwards compatibility with RHEL8 (except ImportError-cases).

The network-fencing part isnt currently used, so that will have to be addressed in the future if there is a reason to use that part again.

So the only part that needs updating is the cloud-imports it seems like (should have fallbacks with except ImportError until RHEL8 is EOL).

[glaubitz]

Would it be possible for RHEL-8 to migrate away from the unmaintained msrestazure?

[oalbrigt]

I cant find an equivalent of the msrestazure cloud configs:
https://github.com/Azure/azure-sdk-for-python/blob/main/doc/sphinx/multicloud.rst

Can you point me to an equivalent that we can use instead?
https://github.com/ClusterLabs/fence-agents/blob/main/lib/azure_fence.py.py#L273-L289