calc_hn_rusage(): only account for running containers.
While it is usually not the case, sometimes /proc/user_beancounters contains
values from the old (not currently running) containers. There are a few reasons
why it can be the case, with the most common being a kernel bug.
Nevertheless, calc_hn_rusage() should not use beancounters for not running
CTs. We do so by getting a list of running CTs first, and then for every UBC
check that such UBC ID exist in a list of running CTs.
Similar bug, but for vzmemcheck, is a subject of bug report #1757.
NOTE: calc_hn_rusage() is currently unused. The plan is to introduce
a call to check_hn_overcommitment() (which calls calc_hn_rusage()) on
CT start, so that vzctl could complain if a node is overcommitted.
Whether it will be implemented and when is currently unclear, so for now
we are actually patching some dead code (which might be resurrected later).
http://bugzilla.openvz.org/1757
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
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