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/usr/lib/python2.7/dist-packages/keystoneauth1/tests/unit/data/README is in python-keystoneauth1 3.4.0-0ubuntu1.

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This directory holds the betamax test cassettes that are pre-generated
for unit testing. This can be removed in the future with a functional
test that stands up a full devstack, records a cassette and then
replays it as part of the test suite.

Until the functional testing is implemented do not remove this
directory or enclosed files.