server: add experimental code to persist ring reads

We will read fragments from the ring and stash them away
in the store so we can recover from crashes while reading
packets.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
server: persistent map: add 'min_binding'

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Regenerate OASIS

Signed-off-by: David Scott <dave.scott@eu.citrix.com>