erasure-code: upgrade/firefly-x/parallel-erasure-code

Mimic upgrade/firefly-x/parallel with just one difference: more OSDs (13
total).

The erasure code workloads are moved from firefly-x/parallel to
firefly-x/parallel-erasure-code. Add more erasure code jobs to the final
workload, after the upgrade is complete.

http://tracker.ceph.com/issues/9652 Refs: #9652

Signed-off-by: Loic Dachary <loic-201408@dachary.org>