[SCSI] lpfc: Fix ADISC completion incorrectly putting initiators on mapped list

Symptom - An unmapped node (initiator) that goes away in a situation
such as cable pull, comes back as a mapped node.  Fix - On ADISC
completion, put a list on the mapped list only if it is a FCP_TARGET.

Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>