storage_proxy: honour partition limit
storage_proxy: honour partition limit

At the moment the coordinator does not care much for the partition
limit. In particular it doesn't check whether after reconciliation the
result still contains enough partitions.

This patch makes it honour the partition limit and increase it in the
retried queries if necessary.

Signed-off-by: Paweł Dziepak <e29bb3265626c60caf76d587cabdfcd8b379ef80@scylladb.com>

duarten/scylla,avikivity/scylla,scylladb/scylla,raphaelsc/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,raphaelsc/scylla,scylladb/scylla,duarten/scylla,raphaelsc/scylla,avikivity/scylla,scylladb/scylla