[stgt] backing-store options

[Dan Mick]

For bs_rbd, I need to pass some options through from tgtadm.  I don't 
see a generic mechanism for doing this; there's

* bsoflags, which seems to be an int with O_ flags in it, and

* --params, but those seem specific to --op update and disallowed for 
OP_NEW (and have predefined meanings anyway).

Anyone have any objection to a --bsopts parameter that is free-form and 
interpreted only by the selected backend storage driver?  This would go 
with --backing-store and --bstype and --bsoflags.

(I'm not sure what a good short option letter would be; 'S' is one of 
the few available.)

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