[tests] Adding a common makefile for all of our user tests.
[tests] Adding a common makefile for all of our user tests.

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