Meson's TAP parser won't accept this, unlike Automake's. At the moment
libtest.sh directs stderr to stdout anyway, so there is no practical
effect for this change, but a subsequent commit will remove that merging.
Signed-off-by: Simon McVittie <smcv@collabora.com>
Maybe it's a bit pedantic but we shouldn't be matching
"org.test.Hello.Plugin.fun" when we're trying to match "org.test.Hello",
so add some trailing slashes to prevent that, and change the options on
a few commands so we're only parsing the columns we care about.
