iSCSI: DLB's Last Call T15 comment

[Black_David@emc.com]

John,

[T.15] 4.3.1  Login Phase Start

   The first Login Response PDU during the Login Phase from the iSCSI 
   target SHOULD return the TargetPortalGroupTag key that contains the 
   tag value of the iSCSI portal group servicing the Login Request PDU. 
   If the iSCSI target implementation supports altering the portal group 
   configuration (including adding, deleting, and swapping of portals in 
   a portal group), it MUST return the TargetPortalGroupTag key carry-
   ing the tag value of the servicing portal group.

Let's make returning this key a MUST in all cases - less text, simpler
protocol, simpler code at the Initiator.

> The item numbered T15, had a lot of discussions, especially in the Naming
> and Discovery Team, and the current wordage was the results of a
> compromise, where a number of vendors did not have the issue, and strongly
> felt that it would be the wrong thing to do with their product.  So we
> agreed that the SHOULD section would be the right answer for 
> every one.

This sort of compromise leads to "MAY", not "SHOULD".  I
suggest summarizing the NDT discussion to the list, as it's now an issue
to be settled here.

Thanks,
--David
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David L. Black, Senior Technologist
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