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CA-314317: Protect PVS-cache get_or_recreate_vdi by mutex

The function `Pvs_cache_vdi.get_or_recreate_vdi` may be called for multiple
concurrently starting VMs. Without the mutex, this can lead to multiple VDIs
being created, while the should only be one for a given `PVS_cache_storage`
object.

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>

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