qa/standalone/scrub: re-code osd-scrub-dump.sh to test scrub repair functionality.

The new version of osd-scrub-dump.sh is designed to
allow multiple "corruption methods" on a subset of objects.
The functionality includes specifying:
- the number of objects created;
- the number to have their Primary version modified;
- the number to have their Replicas modified;
- the set of "manipulations" to perform on the objects.

Signed-off-by: Ronen Friedman <[email protected]>

Author: ronen-fr