On Master restart if table is stuck in DISABLING state, CLOSED regions should not be considered stuck in-transition

When master is restarted, in AssignmentManager#loadMeta(), if table is in DISABLED state nothing is done for regions in CLOSED state. But if table is stuck in DISABLING state then CLOSED regions are considered as stuck in-transition. CLOSED regions of DISABLING/ DISABLED table can be handled the same way.