config/node: refactor checking for CollectMode
config/node: refactor checking for CollectMode

shout out to Kir (@kolyshkin) for coming up with this method
Drastically simplify querying systemd for CollectMode.
This is more resistant to the feature being backported into the version shipped in distros.

Signed-off-by: Peter Hunt <fb7b1ad57b81f1e149129d77ecccc59c02fe0648@redhat.com>

kubernetes-incubator/cri-o,nalind/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,kubernetes-incubator/cri-o,nalind/cri-o,nalind/cri-o,kubernetes-incubator/ocid,kubernetes-incubator/ocid