Importing pkg_resources scans every installed distribution to find
all of the entry points. Stevedore is adding a new caching layer using
importlib.metadata, which will not. Switching to the stevedore should
eventually speed up load times, especially for command line apps. This
change makes the switch now to ensure API compatibility.
We were already using stevedore for tests, so this moves the dependency
from test-requirements.txt to requirements.txt and raises the minimum
version to something more recent.
Change-Id: I3e3632783bc745979b6db73e610df8a77ffaceb0
Signed-off-by: Doug Hellmann <doug@doughellmann.com>
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