Until now Raid10->Raid0 takeover was possible only if all the mirrors
where removed before md starts the takeover. Now mdadm, when
performing Raid10->raid0 takeover, will remove all unwanted mirrors
from the array before actual md takeover is called.
Signed-off-by: Maciej Trela <maciej.trela@intel.com> Signed-off-by: Adam Kwolek <adam.kwolek@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>