Wait longer for InProcessServer startup.
This was reliably timing out for me when running the valgrind tests
in parallel.
10 seconds is enough to make “make test ARGS=-j8” work fine here,
and that cuts down the time of a full test run from 1500s to 300s.
That's still too slow, but 5× faster is better than nothing.
Approved by Daniel van Vugt, Kevin DuBois, Robert Carr, Alexandros Frantzis, PS Jenkins bot.