Removed env vars DOCKER_NETWORK_OPTIONS and INSECURE_REGISTRY from docker.service.j2 (#6126)

roles/container-engine/docker/templates/docker.service.j2

@@ -30,9 +30,7 @@ ExecStart={{ docker_bin_dir }}/docker{% if installed_docker_version.stdout is ve
 {% endif %}
           $DOCKER_OPTS \
           $DOCKER_STORAGE_OPTIONS \
-          $DOCKER_NETWORK_OPTIONS \
-          $DOCKER_DNS_OPTIONS \
-          $INSECURE_REGISTRY
+          $DOCKER_DNS_OPTIONS
 {% if not is_ostree and systemd_version.stdout|int >= 226 %}
 TasksMax=infinity
 {% endif %}