[tests/fmm] Remove output file before each run.
[tests/fmm] Remove output file before each run.

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