Update to rocksdb dependency to 0.16.0

[mina86]

Issue: #3266

[mina86]

I’ve given cursory look at the commits between 0.15 and 0.16 and didn’t notice anything breaking. I’ve run cargo test and run the node for a while but don’t really know if that’s sufficient testing for a storage library upgrade.

[ailisp]

@mina86 The failing is about cargo-deny. We disallow any crate in Cargo.lock have two different versions. When there's third party dependency cause this (in this case, rocksdb 0.16), add the exception to deny.toml and make sure cargo-deny check bans pass locally

[bowenwang1996]

@olonho @frol @khorolets please review this PR

[mina86]

Haha. The number of reviewers is too damn high. ;) @olonho, could you also approve?