Also improve KILLPIDS tracking.
Waiting on multiple jobs and relying on wait exit code being != 0 if at
least one process returned != 0 might not be portable but is the best we
can do for now. We can address that in the future.
moduleload ../rel/mod.la works on build directry ex: make test
but it doesn't work with installed slapd.
It should be specified the modulepath and moduleload separately like other tests.