Move core_alua_check_nonop_delay() to transport_handle_cdb_direct() so the
iSCSI target driver doesn't have to call as many core functions
directly. We will eventually merge transport_handle_cdb_direct and
target_submit so iSCSI and the other drivers call a common function.

It will also be helpful as preparation for future changes which allow the
iSCSI target to defer command submission to the LIO submission workqueue,
because we will have a common submission function for that which will be
based on transport_handle_cdb_direct()/target_submit().
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230928020907.5730-3-michael.christie@oracle.comSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>