Tests: Avoid looping on app PIDs during cleanup

Tests: Avoid looping on app PIDs during cleanup

When the list of app PIDs becomes long, eg. in the case for
`tests/regression/ust/nprocesses/test_nprocesses`, then performing the
following type of loop can be quite slow, especially if the apps have
some teardown time internally:

```
for p in ${APP_PIDS} ; do
  kill ${p}
  wait ${p}
done
```

Both `kill` and `wait` take a list of PIDs, so the cleanup is easily
factorable to

```
kill ${APP_PIDS}
wait ${APP_PIDS}
```

In the case of `test_nprocesses`, the test run time drops from ~25s to
~4s. The difference is less important in tests with fewer apps.

Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I9619939b4f1201a99f9666dee3e19551a67c9fb6