runTrigART.py: fix issues with running in master--py3

Rafal Bielskirequested to merge
rbielski/athena:runTrigART-py3 into master

Fix two issues:

  • py2->py3 incompatibility of dict.iteritems()
  • the nightly is named master--py3 not master, so art.py needs the --run-all-tests flag to force running tests even if they only have #art-include: master/Athena

Thanks to @hrussell for reporting the issues

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