[build_system] Wrap the tests_to_clean
[build_system] Wrap the tests_to_clean

mit-carbon/Graphite-Cycle-Level,fhijaz/Graphite,victorisildur/Graphite,8l/Graphite,mit-carbon/Graphite,mit-carbon/Graphite,mit-carbon/Graphite,mit-carbon/Graphite-Cycle-Level,mit-carbon/Graphite-Cycle-Level,fhijaz/Graphite,mit-carbon/Graphite,fhijaz/Graphite,8l/Graphite,nkawahara/Graphite,8l/Graphite,8l/Graphite,nkawahara/Graphite,victorisildur/Graphite,nkawahara/Graphite,mit-carbon/Graphite-Cycle-Level,nkawahara/Graphite,victorisildur/Graphite,fhijaz/Graphite,victorisildur/Graphite