With the testsuite format you will get a setup_tests(tests_manager,
options) function called for each TestManager.
The function will have the exact same role as with old config
file but with a clean API and not magic global variables.
This implies that we need default blacklist to be directly set
on the TestManager and not on options.blacklisted_test
The default testsuite implementation should belong to the default
asset repo where we have the corresponding knowledge.
We should style manage a sensible list of known blacklisted tests,
encoding profiles, and generators in GstValidate itself and allow testsuite
actual implementations to easily use them though the register_default_*
methods.
This allow us to be able to remove the ugly execfile() call.
