test_progs's IMA selftests requires extra Kconfig values, so update
latest.config to accommodate those.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
vmtest is run as a TravisCI job in order to test libbpf backward compatibility
with the older kernels
Add config files required to build and run bpf kernel selftests in vmtest:
- latest.config: latest kernel config
- INDEX: links to binaries (kernels, disk image) to download
- blacklist/BLACKLIST-${kernel}: blacklisted bpf program tests for ${kernel}
