Changed workloads in 2-workload to run in parallel
Fixes #10233

Signed-off-by: Yuri Weinstein <yuri.weinstein@inktank.com>
Changed to run each workload on own client to avoid conflits

Signed-off-by: Yuri Weinstein <yuri.weinstein@inktank.com>
Added more logging

Signed-off-by: Yuri Weinstein <yuri.weinstein@inktank.com>
Merge pull request #258 from ceph/wip-10233

Changed workloads in 2-workload to run in parallel