-rP is an alternative to `-s` for viewing the output of passing tests.
This causes the captured stdout/stderr of passing tests to be output in
the same way as that of failing tests.
-rp adds a simple one-line-per-test summary for passing tests.
Neither option is included by -ra.
Additional changes to `pytest_capturelog` and `pytest_catchlog` are
needed for this option to also output captured logs: They must be
changed to use `rep.sections.add` instead of `rep.longrepr.addsection`,
and to add these additional sections even if the test passes, since
passing tests don't seem to have a `longrepr` at report time.
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