[SCSI] lpfc 8.3.17: Code Cleanup and Locking fixes

- Move Unload flag earlier in vport deletei to stop ELS traffic
- Replaced some unnecessary spin_lock_irqsave with spin_lock_irq
- Fixed circular spinlock dependency between low-level driver and SCSI midlayer
- Remove duplicate code from lpfc_els_retry routine
- Make all error values negative

Signed-off-by: Alex Iannicelli <alex.iannicelli@emulex.com>
Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>