oo-accept-node changed the cgroups check to ignore defunct processes

Changed the oo-accept-node cgroups check to ignore defunct processes as these
processes can't consume any resources, so it's normal for the kernel to remove
them from cgroups.
Merge pull request #2556 from twiest/dev/twiest/oo-accept-node/cgroups-defunct-procs

Merged by openshift-bot
<oo-accept-node> Bug 964089 - Fix check_cgroup_procs

https://bugzilla.redhat.com/show_bug.cgi?id=964089

Check for UIDs that are between GEAR_MIN_UID and GEAR_MAX_UID

Support for mounting cgroup controllers either under /cgroup/all or
/cgroup/<controller>