imsm: FIX: Just created redundant array is not in uninitialized state

imsm: FIX: Just created redundant array is not in uninitialized state

When redundant array (e.g. raid5) is created metadata shows it is in
normal state. Initialization process is showed in metadata as rebuild from normal
to normal state. Redundant array should be initially in uninitialized state
before it's initialization.

Add code to put array in uninitialized state upon array creation.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>