tcp: Implement hash table with indices rather than pointers

We implement our hash table with pointers to the entry for each bucket (or
NULL).  However, the entries are always allocated within the flow table,
meaning that a flow index will suffice, halving the size of the hash table.

For TCP, just a flow index would be enough, but future uses will want to
expand the hash table to cover indexing either side of a flow, so use a
flow_sidx_t as the type for each hash bucket.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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