Collect logs for containers only if docker runs

If no docker service runs on the host, but docker is installed,
docker stats command hangs forever. Prevent running all docker
commands if no docker service is running.

Change-Id: I697ed2bde251513ece0a25f7d2b51074f11e9c3e

roles/collect-logs/tasks/collect.yml

@@ -137,7 +137,7 @@
 
     - name: Collect docker info and logs
       shell: >
-        if command -v docker; then
+        if command -v docker && systemctl is-active docker; then
             All_FILE=/var/log/extra/docker_allinfo.log;
             docker ps --all --size &> $All_FILE;
             docker images &>> $All_FILE;