enabled TrigHTTInput ctest to read/write wrapper files
Related to one of the small improvements for HTTSim migration as listed in https://its.cern.ch/jira/browse/EFTRACK-11
Enables c-test to read and write Wrapper files.
Requires copy of the slice file to CVMFS (opening https://its.cern.ch/jira/browse/ATLINFR-4549)
Edited by Francesca Pastore