Botond Dénes 9ede82ebf8 memtable: pass a valid permit to the delegate reader ...

All reader are soon going to require a valid permit, so make sure we
have a valid permit which we can pass to the delegate reader when
creating it. This means `memtable::make_flat_reader()` now also requires
a permit to be passed to it.
Internally the permit is stored in `scanning_reader`, which is used both
for flushes and normal reads. In the former case a permit is not
required.

2020-05-28 11:34:35 +03:00

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