samba.tests.dsdb is not idempotent

[Lumir Balhar]

Hello.

When the test 
samba.tests.dsdb.DsdbTests.test_set_attribute_replmetadata_version is 
run two times in the same test run, it fails. This is a problem for 
Python3 porting, where the tests need to be run for both versions of the 
interpreter in the same run.

The trouble is that I'm lost as to what the test actually does -- I'm 
not familiar with terms like "sequence number" or "USN", and the code 
calls a maze of functionality deep inside Samba/LDB.

Could I ask you to look at the issue and provide a pointer into what's 
wrong here?
I'm attaching a reproducer (run with `make test TESTS=tests.dsdb`).

Thank you and have a nice day.

Lumír

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