sandbox/cgroup, tess/main: fix unit tests on v2 system, disable broken tests on sid #9828
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Since 21.12.2020 (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=943981)
Debian Sid is using a unified cgroup hierarchy (v2). Disable tests that fail on
such system. Fix sandbox/cgroup unit tests to apply proper mocking of v1 support.