Sweeping !22537 from 21.3 to 21.9. Improve log file post-processing in TriggerTest

Improve log file post-processing in TriggerTest

See merge request !22537 (merged)

added sweep:from 21.3 label

Adding original author @rbielski as watcher.

restored source branch cherry-pick-1f89e16358-21.9

This merge request affects 1 package:

• Trigger/TrigValidation/TriggerTest

Adding @rbielski as watcher

added 21.9 Trigger review-pending-level-1 labels

CI Result SUCCESS

	Athena
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-22578-2019-04-11-04-43
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 36878]

There are no CI issues. Approving.

Jason (L1 shifter)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 689bd947