Disable iscsi.service to avoid iscsid on host from getting started
Disable iscsi.service to avoid iscsid on host from getting started

When some stale shutdown happens on the node, iscsi.service detects
remaining information about iscsi connection, and recovers connections
based on the information, with starting iscsid service on host.
This causes a collision between iscsid on host and iscsid in container,
which makes iscsid container keep restarting.

This patch makes sure that iscsi.service on host is disabled
when we deploy iscsid container, to avoid iscsid on host is started
unexpectedly.

Change-Id: I6c36cd15edfa53c3c76be9095ff40cecf451490d
Closes-Bug: #1833019

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates