[tests] Rename misc functional tests
Summary:
Rename only
Partial backport of core PR11774 (commit 3150b3f)
Depends on D2380
Test Plan:
./test/functional/test_runner.py --extended
Reviewers: #bitcoin_abc, deadalnix, jasonbcox
Reviewed By: #bitcoin_abc, jasonbcox
Subscribers: teamcity, schancel
Differential Revision: https://reviews.bitcoinabc.org/D2381