Prevent DoS from guest trying to allocate too much data on host for chunks

Limit number of chunks to a given amount to avoid guest trying to
allocate too much memory. Using circular or nested chunks lists
guest could try to allocate huge amounts of memory.
Considering the list can be infinite and guest can change data this
also prevents strange security attacks from guest.

Signed-off-by: Frediano Ziglio <fziglio@redhat.com>

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