Deleted tablets may not quiesce maintenance operations in a timely fashion

With multiple maintenance manager threads, if a tablet is very under-compacted, and you delete the tablet, it will get stuck in 'QUIESCING' state for quite some time. It seems like new maintenance operations will still start on that tablet even though it is in 'quiescing' state. This can cause a tablet to remain for quite some time running compactions even after its table has been deleted.