[Bug 270608] devel/py-stevedore: Fails with python 3.7

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270608

            Bug ID: 270608
           Summary: devel/py-stevedore: Fails with python 3.7
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: nivit@FreeBSD.org
          Reporter: jonc@chen.org.nz
          Assignee: nivit@FreeBSD.org
             Flags: maintainer-feedback?(nivit@FreeBSD.org)

When running with < python 3.8 flavor, eg: py37-stevedore, a load eventually
fails with:

...
  File "/usr/local/lib/python3.7/site-packages/stevedore/extension.py", line
19, in <module>
    from . import _cache
  File "/usr/local/lib/python3.7/site-packages/stevedore/_cache.py", line 18,
in <module>
    import importlib.metadata as importlib_metadata
ModuleNotFoundError: No module named 'importlib.metadata'

The code line in _cache.py has:

import importlib.metadata as importlib_metadata

But in python versions before 3.8, importlib.metadata is stored under
importlib_metadata.

Changing the line to read:

import importlib_metadata

fixes the problem.

I think a conditional patch depending on flavor is required for the port.

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