Tests fail if preprovisioned accounts picked from the same project.

env:
- use preprovisioned accounts for tests.
- static accounts file contains accounts. Some accounts of static accounts file are from the same project and some accounts from different projects.

Many tests fail:

Traceback (most recent call last):

  File "/var/lib/openstack/lib/python3.6/site-packages/tempest/api/compute/servers/test_servers_negative.py", line 615, in test_update_server_of_another_tenant

    name=new_name)

  File "/var/lib/openstack/lib/python3.6/site-packages/testtools/testcase.py", line 489, in assertRaises

    self.assertThat(our_callable, matcher)

  File "/var/lib/openstack/lib/python3.6/site-packages/testtools/testcase.py", line 502, in assertThat

    raise mismatch_error

testtools.matchers._impl.MismatchError: <bound method ServersClient.update_server of <tempest.lib.services.compute.servers_client.ServersClient object at 0x7fe5e9692898>> returned {'server': {'id': '9fafdc92-7782-466f-948b-94dddbed12bb', 'name': '9fafdc92-7782-466f-948b-94dddbed12bb_new', 'status': 'ACTIVE', 'tenant_id': 'a363b884e59e453d93b34dd70888e9c1', 'user_id': 'c614029d381049dd80f9e4fb2df3f3a2', 'metadata': {}, 'hostId': '939e120cb312fde986e5ce8c29e4e68799344615f563f347079ddc83', 'image': {'id': '49361c2b-ac92-4597-ad93-fc77fe9e61df', 'links': [{'rel': 'bookmark', 'href': 'https://nova.it.just.works/a363b884e59e453d93b34dd70888e9c1/images/49361c2b-ac92-4597-ad93-fc77fe9e61df'}]}, 'flavor': {'id': 'c46c6773-8559-4cfe-a7aa-48003f5ff2af', 'links': [{'rel': 'bookmark', 'href': 'https://nova.it.just.works/a363b884e59e453d93b34dd70888e9c1/flavors/c46c6773-8559-4cfe-a7aa-48003f5ff2af'}]}, 'created': '2021-10-19T06:01:01Z', 'updated': '2021-10-19T06:01:10Z', 'addresses': {'tempest-manual-0': [{'version': 4, 'addr': '192.168.0.185'}]}, 'accessIPv4': '', 'accessIPv6': '', 'links': [{'rel': 'self', 'href': 'https://nova.it.just.works/v2.1/a363b884e59e453d93b34dd70888e9c1/servers/9fafdc92-7782-466f-948b-94dddbed12bb'}, {'rel': 'bookmark', 'href': 'https://nova.it.just.works/a363b884e59e453d93b34dd70888e9c1/servers/9fafdc92-7782-466f-948b-94dddbed12bb'}], 'OS-DCF:diskConfig': 'MANUAL', 'progress': 0}}

Trace:

testtools.testresult.real._StringException: pythonlogging:'': {{{

2021-10-19 06:00:51,132 24 DEBUG [urllib3.connectionpool] Resetting dropped connection: nova.it.just.works

2021-10-19 06:00:51,637 24 DEBUG [urllib3.connectionpool] https://nova.it.just.works:443 "GET /v2.1/a363b884e59e453d93b34dd70888e9c1/servers/d464ca40-cc8e-4be7-9909-899c88e41899 HTTP/1.1" 200 1680

2021-10-19 06:00:51,648 24 DEBUG [urllib3.connectionpool] Starting new HTTPS connection (1): nova.it.just.works:443

2021-10-19 06:00:52,058 24 DEBUG [urllib3.connectionpool] https://nova.it.just.works:443 "DELETE /v2.1/a363b884e59e453d93b34dd70888e9c1/servers/d464ca40-cc8e-4be7-9909-899c88e41899 HTTP/1.1" 204 0

}}}

Traceback (most recent call last):

  File "/var/lib/openstack/lib/python3.6/site-packages/tempest/api/compute/servers/test_servers_negative.py", line 623, in test_delete_a_server_of_another_tenant

    self.server_id)

  File "/var/lib/openstack/lib/python3.6/site-packages/testtools/testcase.py", line 489, in assertRaises

    self.assertThat(our_callable, matcher)

  File "/var/lib/openstack/lib/python3.6/site-packages/testtools/testcase.py", line 502, in assertThat

    raise mismatch_error

testtools.matchers._impl.MismatchError: <bound method ServersClient.delete_server of <tempest.lib.services.compute.servers_client.ServersClient object at 0x7fe5e9692898>> returned {}

Tests fail because accounts from the same project were picked from static accounts file.
Accounts are picked randomly and there is not validation which forbid to pick accounts from the same project.