…ed by kubelet (#758)

* cgroup: Match the name of the cgroup to what is expected by kubelet

Ensure consistent naming of system cgroup in order to ensure that it matches
cgroup name expected by Kubelet.

Signed-off-by: Swati Sehgal <swsehgal@redhat.com>

* cgroup: test: update content source for netdev physical rps rules

Signed-off-by: Swati Sehgal <swsehgal@redhat.com>

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Signed-off-by: Swati Sehgal <swsehgal@redhat.com>