added DoubleEventSelectorOverlayTest.py UT to CI

Miha Muskinjarequested to merge
mmuskinj/athena:master-DES-UT into master

Now that input files are available on cvmfs and DES is a bit improved, I've added one additional CI test.

Also improved regular expressions of existing DoubleEventSelector unit tests.

Edited by Miha Muskinja

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