Fix parallel workunit issues.

Fixed the spacing of workunits inside 2-workload and 4-final-workland
files.  Removed parallel final-workload reference from dumpling.yaml.

Fixes: 7633
Signed-off-by: Warren Usui <warren.usui@inktank.com>
Merge pull request #14 from ceph/wip-final-workload-wusui

Fix parallel workunit issues.