MFC r272409: Use REPORT LUNS command for SPC-2 devices with LUN 0 disconnected.
MFC r272409:
Use REPORT LUNS command for SPC-2 devices with LUN 0 disconnected.

SPC-2 tells REPORT LUNS shall be supported by devices supporting LUNs other
then LUN 0.  If we see LUN 0 disconnected, guess there may be others, and
so REPORT LUNS shall be supported.

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