.clang-format

run-test: allow relative path in `--blacklist` and `--whitelist` (issue6351)

When specifying a test with `--blacklist` or `--whitelist` with path relatives
to the repository root (eg: `tests/test-check-commit.t`) the file is not taken
into account. It only works when the name of the test is given.

It would be better if `--blacklist` and `--whitelist` behaviors where compatible
with `--test-list`.

This patch allows to use relative path with `--blacklist` and `--whitelist`
while staying compatible with the old behavior by checking the test relative
path in addition to its name.

Differential Revision: https://phab.mercurial-scm.org/D9024

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