Add call to EventDataSvc.clearStore to gaudiiter.py

Make sure to cleanup the TES before changing the geometry, to prevent hanging in a mutex lock. See also https://its.cern.ch/jira/browse/LHCBPS-1850?focusedCommentId=3264855

assigned to @wouter

assigned to @acasaisv

@wouter Could you please add some relevant labels to the MR, please ?

/ci-test --merge

Started reference and integration test builds. Once done, check the comparison of build and test results.

• [2020-06-26 16:49] Validation started with lhcb-master-mr#992

added bug fix label

assigned to @jonrob and unassigned @acasaisv

merged

mentioned in commit 6d71e4ee

unassigned @jonrob and @wouter

added Configuration label

removed Configuration label