Randomise default File Catalog name

Merged Marco Cattaneo requested to merge cherry-pick-17aea6f5-3 into hlt2012-patches

Since the introduction of running tests in parallel in the nightlies, tests are randomly failing because they try to write concurrently a XML FileCatalog with the same (default) name. This MR randomises the default name so that each test writes to a unique file. Works for all tests that use IOHelper to set up the persistency.

Edited by Marco Cattaneo

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