Low: iscsi: use check_binary
Low: iscsi: use check_binary

open_iscsi_setup: use standard check_binary test rather than explicit
                  which magic when checking for iscsiadm

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