storvsc: Untangle the storage protocol negotiation from the vmbus protocol negotiation.

storvsc: Untangle the storage protocol negotiation from the vmbus protocol negotiation.

Currently we are making decisions based on vmbus protocol versions
that have been negotiated; use storage potocol versions instead.

[jejb: fold ARRAY_SIZE conversion suggested by Johannes Thumshirn
<[email protected]>
make vmstor_protocol static]
Tested-by: Alex Ng <[email protected]>
Signed-off-by: Keith Mange <[email protected]>
Signed-off-by: K. Y. Srinivasan <[email protected]>
Signed-off-by: James Bottomley <[email protected]>