ORA-02055 from ut_runner when having a non-manual rollback test on a DB Link #601

Setting:
We have a view available via DB link and a test which selects from it. The test-suite is rollback-automatic, not manual.

Problem:
Wenn calling ut_runner.run we get ORA-02055 after all tests are run (not immediately after the DB-link test).
If we switch the DB link test to rollback-manual it's not an issue (as long as we rollback properly)
ut.run doesn't have that problem because of an additional rollback.

We should maybe catch that situation more specifically and add a test