flush_queue_test: Add test for multiple ops per key
flush_queue_test: Add test for multiple ops per key

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