tests/runall: Remove POSIX-ism
tests/runall: Remove POSIX-ism

Apparently, the default grep on Solaris 9 does not support -q, so
instead of using that, redirect the output to /dev/null.

Reported-by: Viktor Tusa <544bb2381d1374000e7b2e6d7e4ea32943e21c0a@balabit.hu>
Signed-off-by: Gergely Nagy <6780fac3b38619ac20422286e4110a70dbba2203@balabit.hu>

algernon/libmongo-client,algernon/libmongo-client,algernon/libmongo-client