md-cluster: wake up thread to continue recovery

In recovery case, we need to set MD_RECOVERY_NEEDED
and wake up thread only if recover is not finished.

Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>