Merge pull request openshift#18314 from mgugino-upstream-stage/fix-no…

…de-syscon-unit

Automatic merge from submit-queue (batch tested with PRs 18314, 18313).

Fix node system container service template

node image may not always be deployed with docker.

This commit templates the 'WantedBy' to ensure
node can start with target.wants of each
respective runtime.

images/node/system-container/service.template

@@ -21,4 +21,4 @@ WorkingDirectory=$DESTDIR
 RuntimeDirectory=${NAME}
 
 [Install]
-WantedBy=docker.service
+WantedBy=${DOCKER_SERVICE}