[SCSI] be2iscsi: Fix session update context with V2 version.

For updating session context on adapter, V2 version is to
be used with the latest adapter. This fix checks for the adapter type
and uses correct version of session context.

Signed-off-by: John Soni Jose <sony.john-n@emulex.com>
Signed-off-by: Jayamohan Kallickal <jayamohan.kallickal@emulex.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>