Fix install-docker role

1. systemctl is not available on Ubuntu 14.04, so using
   "service docker restart" as a workaround.
2. change option "--r" position in spark-inegration-test-minikube-k8s
   job to avoid "--r" is bypassed to mvn.

Related-Bug: theopenlab/openlab#308
Related-Bug: theopenlab/openlab#310

playbooks/spark-integration-test-minikube-k8s/run.yaml

@@ -17,7 +17,7 @@
         kubectl create clusterrolebinding spark-role --clusterrole=edit --serviceaccount=default:spark --namespace=default
 
         # NOTE: the distribution step may fail due to dependencies downloading failure, so we suport retry
-        for i in $(seq 1 3); do ./dev/make-distribution.sh --tgz -Pkubernetes --r && s=0 && break || s=$? && sleep 5; done; (exit $s)
+        for i in $(seq 1 3); do ./dev/make-distribution.sh --r --tgz -Pkubernetes && s=0 && break || s=$? && sleep 5; done; (exit $s)
 
         pushd resource-managers/kubernetes/integration-tests
         dev/dev-run-integration-tests.sh --spark-tgz $(realpath ../../../spark-*.tgz) --namespace default --service-account spark

roles/install-docker/tasks/main.yml

@@ -27,8 +27,8 @@
       iptables -P FORWARD ACCEPT
       iptables -P OUTPUT ACCEPT
 
-      # Restart docker.
-      systemctl daemon-reload
-      systemctl restart docker
+      # NOTE: systemctl is not available in Ubuntu 14.04, so use "service"
+      # command for compatibility
+      service docker restart
 
     executable: /bin/bash