The previous diff touched most files in ./test/, so bump the headers to
avoid having to touch them again for a bump later.
-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./test/
-END VERIFY SCRIPT-
This value is no longer used and is instead specified statically
in chainparams. This change means that previously generated
snapshots will no longer be usable.
Commit 1abcecc40c518a98b7d17880657ec0247abdf125 replaced 'regtest' by self.chain
'regtest' "in almost all current tests", this commit takes care of the remaining
ones.