Log formatter: add BATS summary line

BATS emits a summary line (number of tests passed/failed)...
but only on a tty or when run with --pretty! In our CI
context, with TAP output, it gives no end summary.

Fix that. Keep track of 'ok', 'not ok', and 'skipped',
and display the counts at the end.

Also: add a regression test. You don't need to review
or even read it: it's stark, and I'm not even enabling
it for CI because it almost certainly won't run due to
missing Perl library modules. It's just something I
need on my end.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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