host-validate: Be more careful when checking for cgroup mounts
The existing code is built on the assumption that no cgroup name can appear as part of another cgroup name; moreover, cgroups are expected to always be listed in a specific order. If that's not the case, eg. 'cpuacct' is listed before 'cpu', the algorithm fails to detect the cgroup mount point. Rewrite it to get rid of such assumptions.
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