Medium: iscsi: use iscsiadm -m session -r in stop
Medium: iscsi: use iscsiadm -m session -r in stop

Removes dependency on the portal and seems more natural to logout
the session rather than to use the node mode.

stevenraspudic/resource-agents,asp24/resource-agents,stevenraspudic/resource-agents,asp24/resource-agents,asp24/resource-agents,stevenraspudic/resource-agents