Tasks are failing since using "data" pool no longer part of default install

Create a pool specifically for each task

Fixes: 8930

Signed-off-by: David Zafman <david.zafman@inktank.com>
Merge pull request #303 from ceph/wip-8930

Tasks are failing since using "data" pool no longer part of default install

Reviewed-by: Sage Weil <sage@redhat.com>