BugLink: http://bugs.launchpad.net/bugs/1541456

This patch adds interface to send explicit LOGO
explicit LOGO using using ELS commands from driver.
Signed-off-by: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
(cherry picked from commit 6eb54715)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>