[patch] CTL should check condition INQUIRY with invalid LUN

[Chuck Tuffli]

Currently, the CTL responds to INQUIRY commands targeted at invalid
LUNs by returning valid data with the peripheral qualifier set to LU
OFFLINE. This patch instead returns a check condition with LU NOT
READY.

Linux initiators see the LU OFFLINE and start creating SG devices, but
are not able to finish. The offline also causes them to keep probing
LUNs.

https://gist.github.com/1981701

---chuck