The root mount is not shared by default, but all other mounts are shared.
So if we create the /tmp mount, this means that we run tests on a shared mount
even if tests run without the --shared option.
PiperOrigin-RevId: 302130790
The benchmark_filter options accepts regex-s, but
the gtest-filter option accepts shell-like wildcards.
Fixes#2034
Signed-off-by: Andrei Vagin <avagin@gmail.com>