pkg/instance: use execprog to do basic instance testing

When we accept new kernels for fuzzing we need more extensive testing,
but syz-ci switched to using syz-manager for this purpose.
Now instance testing is used only for bisection and patch testing,
which does not need such extensive image testing (it may even harm).
So just run a simple program as a testing.
It also uses the same features as the target reproducer,
so e.g. if the reproducer does not use wifi, we won't test it,
which reduces changes of unrelated kernel bugs.

0 files changed, 0 insertions, 0 deletions