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