matthew@ noted a possible misuse of the rwlock used to protect vscsi

from being opened by multiple processes at the same time. then he
pointed out that pool_get can sleep in the middle of scsi_cmd,
during which time the process processing the vscsi requests can go
away.

this uses a state variable to protect vscsi from multiple opens
which is checked by all the process and scsi midlayer entrypoints.
it avoids a potential sleep in the middle of the scsi_cmd handler
by moving to iopools.

lots of tweaks and feedback by matthew@

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