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>

openstacksdk added support for using image import as a fallback
which is transparently supported here, but also provides an
override flag to allow a user to force use of import. Expose that
here.

Depends-On: https://review.opendev.org/737608
Change-Id: Ied938a8f63f305305a20ace42e9f4c84b0a5c00e

These translation sections are not needed anymore, Babel can
generate translation files without them.

Change-Id: Ic5d57186766257e9d37b3588e71f973cddad9be4

We've depended on openstacksdk for config for ages now, clean up
after ourselves and stop installing it in tests.

Change-Id: I66b3ec2a36bc462d2f1ac151e95ccbdc946076b8

Congress and python-congressclient have been retired and also
removed from global requirements, thus requirements-check job fails.

Remove congress from this repo.

Change-Id: Ibf68fee49e69264a1c46b2f456901d2620befe3c

Now that we no longer support py27, we can use the standard library
unittest.mock module instead of the third party mock lib.

Change-Id: Ibd39328c27b68190e2edbf1f52fcea52db3ae791
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>