io-tester: Configure class bandwidth
io-tester: Configure class bandwidth

Just yet another parameter in the workload config yaml

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

syuu1228/seastar,scylladb/seastar,avikivity/seastar,syuu1228/seastar,scylladb/seastar,avikivity/seastar,syuu1228/seastar,scylladb/seastar,avikivity/seastar