selftests/bpf: emit processing progress and add quiet mode to veristat

Emit "Processing <filepath>..." for each BPF object file to be
processed, to show progress. But also add -q (--quiet) flag to silence
such messages. Doing something more clever (like overwriting same output
line) is to cumbersome and easily breakable if there is any other
console output (e.g., errors from libbpf).

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20220923175913.3272430-5-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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