Original script:
-BEGIN VERIFY SCRIPT- ./contrib/devtools/copyright_header.py update ./src/bench/ ./contrib/devtools/copyright_header.py update ./src/test/ -END VERIFY SCRIPT-
Completes backport of core PR15788:
https://github.com/bitcoin/bitcoin/pull/15788/commits/faf400077d0144363c2dd24187431d958fb149a9
Depends on D5494.
Subset of test files only for ease of review.