iotests/297: Cover tests/

297 so far does not check the named tests, which reside in the tests/
directory (i.e. full path tests/qemu-iotests/tests).  Fix it.

Thanks to the previous two commits, all named tests pass its scrutiny,
so we do not have to add anything to SKIP_FILES.

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Reviewed-by: Willian Rampazzo <willianr@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210902094017.32902-6-hreitz@redhat.com>

tests/qemu-iotests/297

@@ -55,8 +55,9 @@ def is_python_file(filename):
 
 
 def run_linters():
-    files = [filename for filename in (set(os.listdir('.')) - set(SKIP_FILES))
-             if is_python_file(filename)]
+    named_tests = [f'tests/{entry}' for entry in os.listdir('tests')]
+    check_tests = set(os.listdir('.') + named_tests) - set(SKIP_FILES)
+    files = [filename for filename in check_tests if is_python_file(filename)]
 
     iotests.logger.debug('Files to be checked:')
     iotests.logger.debug(', '.join(sorted(files)))