[stgt] [PATCH] Allow backends to specify which opcodes they support

[Ronnie Sahlberg]

Tomo, List

Please find a patch that adds an optional "which opceds are supported" array
to the backend template.
RDWR and SHEEPDOG are modified to use these, and the opcodes that are NOT
supported by sheepdog are zeroed out so that tgtd will now respond
correctly with INVALID_OP_CODE if they are sent to a sheepdog backed LUN.

Next will be RBD but there are pending patches to that backend so I will send
and update to it later.


Please comment/review/merge

regards
ronnie sahlberg

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