test: skip test-cgroup-id on ENOSYS from cg_cgroupid_open

test: skip test-cgroup-id on ENOSYS from cg_cgroupid_open

Most container managers will block open_by_handle_at with seccomp to
mitigate a container escape attack. LXD in particular returns ENOSYS
rather than e.g. EPERM like nspawn. Skip this test if we get ENOSYS
from open_by_handle_at via cg_cgroupid_open.

(cherry picked from commit 82f57401d933596746c32a955773bc70be53b0ac)