Merge branch 'default-hlt-global-tag' into '21.1'

update the default global HLT tag to CONDBR2-HLTP-2018-01

See merge request atlas/athena!13129

(cherry picked from commit 8a9d194917bfa1c57e586a0061039ab03b672903)

5ab69795 update the default global HLT tag to CONDBR2-HLTP-2017-04
752c49cf update to 2018-01
daa9d82a Merge branch '21.1' of ssh://gitlab.cern.ch:7999/atlas/athena into default-hlt-global-tag