Comment 7 for bug 2066214

Seems like the client we have in this test can list other users' keypairs:
https://opendev.org/openstack/tempest/src/commit/89a6811cd060bdec92f5efa1e53fd90b3961982a/tempest/api/compute/admin/test_keypairs_v210.py#L41-L44

however, the admin client we use in 'tempest cleanup' can't do that, it always lists its own keypairs (even if user_id is passed).

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the only thing that is different between the manager in the 'tempest cleanup' and the manager in the mentioned test is the credential sourcing mechanism, the test gets the admin manager somehow from this (credentials set to ['primary', 'admin']):
https://opendev.org/openstack/tempest/src/commit/89a6811cd060bdec92f5efa1e53fd90b3961982a/tempest/api/compute/admin/test_keypairs_v210.py#L27-L33

while the 'tempest cleanup' gets it using this method:
https://opendev.org/openstack/tempest/src/commit/89a6811cd060bdec92f5efa1e53fd90b3961982a/tempest/cmd/cleanup.py#L182-L183