The command will be used to allow travis script to know which boards are
already supported by the waf build system. This is useful while the transition
to the new build system is on going. The command can be removed when the
transition is done and it's not used anywhere besides travis script.
It was implemented in such a way that gtest is required only if the user wants
to build and run tests. Initially we're considering all tests should be gtests.
We can change that assumption in the future if necessary.
We're currently using the tests standard error for reporting tests. We can add
TAP later to integrate with other tools.
Additionally, this patch simplifies the exclude patterns passed to
collect_dirs_to_recurse.
Gustavo Jose de Sousa
Lucas De Marchi
Caio Marcelo de Oliveira Filho