[build/tests] Fix errors and comments in test makefile.
[build/tests] Fix errors and comments in test makefile.

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