rocksdb: remove and simplify a bunch of stuff #662
Merged
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Summary of changes:
KeyValueDB::restore
is removed. IIRC this was mainly used the parity-ethereum. I grepped usage in substrate and didn't find anyRwLock
around the inner db was needed for this method and now it's goneadd_column
andremove_last_column
now require&mut self
owning_ref
is gone 馃帀Closes #659