requested to merge ssnyder/athena:selected.AthContainersInterfaces-20181219 into master
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getSelectedAuxIDs() was returning a value by const reference, which was problematic for thread-safety, since that requires saving a copy of the set in the AuxSelector object. Change to returning by value. Now that auxid_set_t is represented by a bitmap with a move operator, that should not be very expensive.
Also change AuxDiscoverySvc::getauxIDs() to return by value.