Miscellaneous Discovery fixes:
- Fix rejection followed by acceptance in handling RPL and RPS
  unsolicited events
- Fix for vport delete crash
- Fix PLOGI vs ADISC race condition
Signed-off-by: NJames Smart <james.smart@emulex.com>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>