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core.lua: fix for cgroups removed outside ulatencyd (issue #28)
fixes issue #28: CGroup properties not set. Reason: Whenever scheduler finds matching rule for scheduled process, it calls CGroup.get_group(name) to check if cgroup does exist. This used to check only if cgroup is contained in the internal _CGroup_Cache - not if it really does exist in cgroup filesystem. So if the cgroup was removed outside ulatencyd and therefore was not removed from _CGroup_Cache, cgroup will not be recreated and will loose all settings (default parameters, rule parameters, parameters adjusted by adjust_new). + CGroup.get_group(): test if cgroup is really present in filesystem, otherwise return false or nil. + CGroup.new(): always create requested cgroup. If it is already contained in _CGroup_Cache, replace it with new one. Code should check its existence before calling CGroup.new() anyway. Real fix would involve changing ulatencyd_cleanup.lua in a way it tells ulatencyd to remove that cgroup. Ulatencyd should also update its internal structures and do clean up, i.e. handle remaining memory charges.
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