Added "+"to all workloads to reduce amount of jobs

Signed-off-by: Yuri Weinstein <yuri.weinstein@inktank.com>
Removed second rgw task as we need only one when combibed (+) workloads s3tests abd swift

Signed-off-by: Yuri Weinstein <yuri.weinstein@inktank.com>
Merge pull request #224 from ceph/wip-9710

Wip 9710