Remove rockdb subtree
Squashed 'src/rocksdb/' content from commit 78b8a7d

git-subtree-dir: src/rocksdb
git-subtree-split: 78b8a7d908d7e67cc6664398e39560b76c965773
Merge commit '7bfb4a9ba5a2822f7d9ef7122b1388aea4be9404' as 'src/rocksdb'
Update rocksdb unity file