release/21.2.48.0

Oana Vickey Boeriu

@boeriu

2bbbeefe · Merge branch 'cherry-pick-48f6fe74 [formerly c311c830a6]-21.2' into '21.2' · Nov 19, 2018

AthDerivation cache for HI production; test_data18HION3 broken; shared writer removed in this cache.